Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Go Back   Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum > General > Tech Talk

Tech Talk Technical Discussion About The Nissan 240SX and Nissan Z Cars


Reply
 
Thread Tools Display Modes
Old 05-19-2017, 06:01 PM   #1
drb5721
Leaky Injector
 
Join Date: Dec 2015
Location: nc
Age: 33
Posts: 77
Trader Rating: (1)
drb5721 is an unknown quantity at this point
Feedback Score: 1 reviews
Need ideas

Installed my built head a few weeks back. It had been sitting for a while so i did not bleed lifters before puttong head on. Engine ran nice and wasnt noisy at all. For the past week ive noticed some rattle noise, light at idle and increases with engine speed. Well, i pulled the valve cover today and start poking away. None of the rocker arms compress at all on the lifter side.

This has me stumped as it is a high and light sound under the valve cover. The other thing i noticed it what looks like carbon buildup on a couple rockers and cam lobes. Ill post a picture as im not sure what i might be looking at.

This head is build to the golden sr head specs. Only thing not in it is solid lifters.
drb5721 is offline   Reply With Quote
Sponsored Links
Old 05-19-2017, 06:07 PM   #2
drb5721
Leaky Injector
 
Join Date: Dec 2015
Location: nc
Age: 33
Posts: 77
Trader Rating: (1)
drb5721 is an unknown quantity at this point
Feedback Score: 1 reviews



drb5721 is offline   Reply With Quote
Old 05-19-2017, 06:11 PM   #3
drb5721
Leaky Injector
 
Join Date: Dec 2015
Location: nc
Age: 33
Posts: 77
Trader Rating: (1)
drb5721 is an unknown quantity at this point
Feedback Score: 1 reviews
Oil change was done when the head was installed. Fresh rotella t6. Pcv valve rattles when shaken and closes when blowing through from hose side. Opens when blowing through valve cover side.
drb5721 is offline   Reply With Quote
Old 05-21-2017, 10:49 AM   #4
drb5721
Leaky Injector
 
Join Date: Dec 2015
Location: nc
Age: 33
Posts: 77
Trader Rating: (1)
drb5721 is an unknown quantity at this point
Feedback Score: 1 reviews
Probably fat fingered the section selection. This might ve better in the engine tech section lol.
drb5721 is offline   Reply With Quote
Old 05-21-2017, 11:36 AM   #5
di-devol
Zilvia FREAK!
 
Join Date: Jun 2010
Location: Woodinville
Age: 42
Posts: 1,412
Trader Rating: (5)
di-devol will become famous soon enoughdi-devol will become famous soon enoughdi-devol will become famous soon enoughdi-devol will become famous soon enough
Feedback Score: 5 reviews
What size are your cams? Not big enough to warrant solid lifters?

If you didn't bleed the lifters, bleed the lifters.
__________________
di-devol is offline   Reply With Quote
Old 05-21-2017, 08:30 PM   #6
drb5721
Leaky Injector
 
Join Date: Dec 2015
Location: nc
Age: 33
Posts: 77
Trader Rating: (1)
drb5721 is an unknown quantity at this point
Feedback Score: 1 reviews
Cams are hks 264s. Not big at all. I should have a nee valve cover gasket here tomorrow so time/weather permitting i guess its out with the lifters
drb5721 is offline   Reply With Quote
Old 05-25-2017, 02:28 PM   #7
drb5721
Leaky Injector
 
Join Date: Dec 2015
Location: nc
Age: 33
Posts: 77
Trader Rating: (1)
drb5721 is an unknown quantity at this point
Feedback Score: 1 reviews
What might be causing the buildup on the rockers and cam?
drb5721 is offline   Reply With Quote
Old 06-23-2017, 02:15 PM   #8
drb5721
Leaky Injector
 
Join Date: Dec 2015
Location: nc
Age: 33
Posts: 77
Trader Rating: (1)
drb5721 is an unknown quantity at this point
Feedback Score: 1 reviews
Hey guys,

So after a bad MAF journey, swapping in the stock cams, and driving for a bit, I am noticing it looks like even the stock cams are getting this carbon/oil buildup by the lobes and on rocker arms. Is this a sign of a bad exhaust valve seal/guide?

I am also getting some loud tapping noises again more-so from the front of the engine that only occurs above 2700 RPM and up during idle or in gear. Only hear it under part throttle. I have disconnected coil connectors with engine running with no difference in noise.

Oil level is full for what its worth.
drb5721 is offline   Reply With Quote
Old 06-23-2017, 02:38 PM   #9
drb5721
Leaky Injector
 
Join Date: Dec 2015
Location: nc
Age: 33
Posts: 77
Trader Rating: (1)
drb5721 is an unknown quantity at this point
Feedback Score: 1 reviews
Any way a mod can move this to sr20 tech?
drb5721 is offline   Reply With Quote
Old 06-23-2017, 06:35 PM   #10
drb5721
Leaky Injector
 
Join Date: Dec 2015
Location: nc
Age: 33
Posts: 77
Trader Rating: (1)
drb5721 is an unknown quantity at this point
Feedback Score: 1 reviews
http://tinypic.com/player.php?v=2lnb...9#.WU2zY64pBoM
drb5721 is offline   Reply With Quote
Old 06-24-2017, 06:58 AM   #11
jedi03
Nissanaholic!
 
Join Date: Jul 2008
Location: albuquerque
Posts: 1,836
Trader Rating: (8)
jedi03 is on a distinguished road
Feedback Score: 8 reviews
The cam cap next to that looks loose to me, but maybe it's getting hot and the oil squirter is just dribbling out oil? Crank with the valve cover off and see what it does
jedi03 is offline   Reply With Quote
Old 06-24-2017, 06:00 PM   #12
drb5721
Leaky Injector
 
Join Date: Dec 2015
Location: nc
Age: 33
Posts: 77
Trader Rating: (1)
drb5721 is an unknown quantity at this point
Feedback Score: 1 reviews
Cam cap definitely wasnt loose. Engine hadnt been off longer before i pulled the valve cover off. I wanna figure out the rattle in that video so i know what my next move is/needs to be. If its bottom end there is no reason to care if its head related. Itll all need redone anyways
drb5721 is offline   Reply With Quote
Old 06-26-2017, 08:00 AM   #13
drb5721
Leaky Injector
 
Join Date: Dec 2015
Location: nc
Age: 33
Posts: 77
Trader Rating: (1)
drb5721 is an unknown quantity at this point
Feedback Score: 1 reviews
I've cleaned these oiling tubes twice already and once again I find it clogged up. Did some cranking with the valve cover off and sure enough some holes were stopped up. Pulled the tubes again and spent about and hour cleaning them. Put them back on and turned it over again and in a matter of seconds a hole or two on each is back to clogged.

Have tried brake clean multiple times from both the banjo hole and each set of squirt holes. Before putting the tubes on, all holes are spraying with the brake clean running through.

Gonna do ANOTHER oil change. Is there anything else I could use to clean these things? Perhaps something to soak them in for a bit that might help loosen/dissolve whatever is clogging the holes?
drb5721 is offline   Reply With Quote
Old 06-26-2017, 08:52 AM   #14
jedi03
Nissanaholic!
 
Join Date: Jul 2008
Location: albuquerque
Posts: 1,836
Trader Rating: (8)
jedi03 is on a distinguished road
Feedback Score: 8 reviews
I used an awl to open the holes up a bit more on one of mine...seemed to help a little...
jedi03 is offline   Reply With Quote
Old 06-26-2017, 11:45 AM   #15
drb5721
Leaky Injector
 
Join Date: Dec 2015
Location: nc
Age: 33
Posts: 77
Trader Rating: (1)
drb5721 is an unknown quantity at this point
Feedback Score: 1 reviews
Seems I have read people recommended NOT to do that. However, I haven't done it so cannot speak for the effects of such an action. I feel like i have read the s14 sr20s oiling tubes have holes that are just a TINY bit bigger which to me is essentially the same as what you have done.
drb5721 is offline   Reply With Quote
Old 06-27-2017, 11:50 AM   #16
drb5721
Leaky Injector
 
Join Date: Dec 2015
Location: nc
Age: 33
Posts: 77
Trader Rating: (1)
drb5721 is an unknown quantity at this point
Feedback Score: 1 reviews
While at work today I am letting the tubes soak in an injector cleaner/brake clean cocktail to see if it will help break down whatever is causing my problem. I am also going to drain the oil and try to clean everything as best as I can this evening after dropping the lower oil pan.
drb5721 is offline   Reply With Quote
Old 06-27-2017, 11:55 AM   #17
tb13
Zilvia Addict
 
tb13's Avatar
 
Join Date: Feb 2014
Location: Arizona ٩( ᐛ )و Subaru Parts Consultant
Age: 29
Posts: 848
Trader Rating: (3)
tb13 is a splendid one to beholdtb13 is a splendid one to beholdtb13 is a splendid one to beholdtb13 is a splendid one to beholdtb13 is a splendid one to beholdtb13 is a splendid one to beholdtb13 is a splendid one to beholdtb13 is a splendid one to beholdtb13 is a splendid one to beholdtb13 is a splendid one to beholdtb13 is a splendid one to behold
Feedback Score: 3 reviews
How does the oil look when you are draining it?
__________________
tb13 is offline   Reply With Quote
Old 06-27-2017, 12:43 PM   #18
drb5721
Leaky Injector
 
Join Date: Dec 2015
Location: nc
Age: 33
Posts: 77
Trader Rating: (1)
drb5721 is an unknown quantity at this point
Feedback Score: 1 reviews
The oil is getting dark. However I have changed the oil every 2500 miles since owning it for a little over a year considering I do not know what the previous maintenance was like. I have roughly 1800 miles on this oil change so a good cleaning certainly won't hurt hence the reason I plan to drop the pan.

It is top end noise, not bearing related, unless its main bearings but it sounds nothing like mains. Pulling coil connectors or injectors does not change the noise when revving and it sounds like its coming from around cylinder 1 which is where one of the oiling holes was clogged up.
drb5721 is offline   Reply With Quote
Old 06-27-2017, 12:51 PM   #19
tb13
Zilvia Addict
 
tb13's Avatar
 
Join Date: Feb 2014
Location: Arizona ٩( ᐛ )و Subaru Parts Consultant
Age: 29
Posts: 848
Trader Rating: (3)
tb13 is a splendid one to beholdtb13 is a splendid one to beholdtb13 is a splendid one to beholdtb13 is a splendid one to beholdtb13 is a splendid one to beholdtb13 is a splendid one to beholdtb13 is a splendid one to beholdtb13 is a splendid one to beholdtb13 is a splendid one to beholdtb13 is a splendid one to beholdtb13 is a splendid one to behold
Feedback Score: 3 reviews
Quote:
Originally Posted by drb5721 View Post
The oil is getting dark. However I have changed the oil every 2500 miles since owning it for a little over a year considering I do not know what the previous maintenance was like. I have roughly 1800 miles on this oil change so a good cleaning certainly won't hurt hence the reason I plan to drop the pan.

It is top end noise, not bearing related, unless its main bearings but it sounds nothing like mains. Pulling coil connectors or injectors does not change the noise when revving and it sounds like its coming from around cylinder 1 which is where one of the oiling holes was clogged up.
Judging by the amount of gunk on your rockers and cams along with dark oil after just 2500miles, I'd say you have either bad valve seals or an issue with your rings. If exhaust gas is finding a way into your crank case or head it'll gunk up the oil and cause build up like you are seeing. Do a compression test and a leak down test and report back.
__________________
tb13 is offline   Reply With Quote
Old 06-27-2017, 12:58 PM   #20
drb5721
Leaky Injector
 
Join Date: Dec 2015
Location: nc
Age: 33
Posts: 77
Trader Rating: (1)
drb5721 is an unknown quantity at this point
Feedback Score: 1 reviews
I will attempt a compression test. Not sure if my grandfather has a good gauge or not. Rings would strike me as an off chance seeing as all this started happening after swapping heads. NEVER had this issue in the other head and compression results were good then. Im wondering if its more-so the dribbling oil now flowing sufficiently enough and its just being "cooked" to the surfaces inside the head. Its only on the cams and rockers. If there were exhaust gases entering, wouldnt i see more of this on other thing such as the cam caps, head studs, etc?
drb5721 is offline   Reply With Quote
Old 06-27-2017, 01:21 PM   #21
tb13
Zilvia Addict
 
tb13's Avatar
 
Join Date: Feb 2014
Location: Arizona ٩( ᐛ )و Subaru Parts Consultant
Age: 29
Posts: 848
Trader Rating: (3)
tb13 is a splendid one to beholdtb13 is a splendid one to beholdtb13 is a splendid one to beholdtb13 is a splendid one to beholdtb13 is a splendid one to beholdtb13 is a splendid one to beholdtb13 is a splendid one to beholdtb13 is a splendid one to beholdtb13 is a splendid one to beholdtb13 is a splendid one to beholdtb13 is a splendid one to behold
Feedback Score: 3 reviews
Quote:
Originally Posted by drb5721 View Post
I will attempt a compression test. Not sure if my grandfather has a good gauge or not. Rings would strike me as an off chance seeing as all this started happening after swapping heads. NEVER had this issue in the other head and compression results were good then. Im wondering if its more-so the dribbling oil now flowing sufficiently enough and its just being "cooked" to the surfaces inside the head. Its only on the cams and rockers. If there were exhaust gases entering, wouldnt i see more of this on other thing such as the cam caps, head studs, etc?
Its hard to tell for sure, If you don't suspect rings, get a hold of a leak down tester and give that a shot. That will tell you if you have a leak some where or if the issue is somehow related to oil delivery in the head.
__________________
tb13 is offline   Reply With Quote
Old 06-28-2017, 10:34 AM   #22
drb5721
Leaky Injector
 
Join Date: Dec 2015
Location: nc
Age: 33
Posts: 77
Trader Rating: (1)
drb5721 is an unknown quantity at this point
Feedback Score: 1 reviews
Drained the oil last night. Seen a VERY small amount of what looked like metallic flake so I proceeded to pull the lower oil pan and pickup and found some materials in the oil pick up that somewhat resembled bronze bearing material. Pulled the upper pan, see nothing on the ledges of it. Gonna pull the rod caps this evening and see what the damage is. If I find something, I will likely just pull the engine completely and do mains while I am in there.
drb5721 is offline   Reply With Quote
Old 06-28-2017, 12:06 PM   #23
battery1882
Zilvia Addict
 
battery1882's Avatar
 
Join Date: Jan 2005
Location: Fullerton, CA
Age: 42
Posts: 700
Trader Rating: (13)
battery1882 will become famous soon enoughbattery1882 will become famous soon enoughbattery1882 will become famous soon enoughbattery1882 will become famous soon enough
Feedback Score: 13 reviews
I see that the retainers have been changed so I assume you have aftermarket springs. What springs are you running? Best thing to do, if you still have your old oil, is to send it to blackstone for oil analysis. That will tell you what materials are high in number. cheapest insurance.
__________________
instagram : battery1882
www.sterculture.com
battery1882 is offline   Reply With Quote
Old 06-28-2017, 12:16 PM   #24
drb5721
Leaky Injector
 
Join Date: Dec 2015
Location: nc
Age: 33
Posts: 77
Trader Rating: (1)
drb5721 is an unknown quantity at this point
Feedback Score: 1 reviews
BC Springs. Oil Analysis would come back skewed as I have run some cleaners through the engine and have only one drain pan. I did not feel any up and down play in the rods, at least not enough to think there is a bad one. But I've had a spun bearing before that I would have NEVER known about had I not been bored and pulled the rod caps.
drb5721 is offline   Reply With Quote
Old 06-29-2017, 06:05 PM   #25
drb5721
Leaky Injector
 
Join Date: Dec 2015
Location: nc
Age: 33
Posts: 77
Trader Rating: (1)
drb5721 is an unknown quantity at this point
Feedback Score: 1 reviews
Engine is out on the stand. Pulled rod bearings. None spun inside the rods luckily but bearings are trashed. Crank is pretty scored on cyl 3 rod journal. Advance auto has a sr20de crank kit for the g20 that come with bearings and all. Might consider this route.

https://m.advanceautoparts.com/p/cra...030%7CL3*16014
drb5721 is offline   Reply With Quote
Old 06-29-2017, 06:07 PM   #26
tb13
Zilvia Addict
 
tb13's Avatar
 
Join Date: Feb 2014
Location: Arizona ٩( ᐛ )و Subaru Parts Consultant
Age: 29
Posts: 848
Trader Rating: (3)
tb13 is a splendid one to beholdtb13 is a splendid one to beholdtb13 is a splendid one to beholdtb13 is a splendid one to beholdtb13 is a splendid one to beholdtb13 is a splendid one to beholdtb13 is a splendid one to beholdtb13 is a splendid one to beholdtb13 is a splendid one to beholdtb13 is a splendid one to beholdtb13 is a splendid one to behold
Feedback Score: 3 reviews
Quote:
Originally Posted by drb5721 View Post
Engine is out on the stand. Pulled rod bearings. None spun inside the rods luckily but bearings are trashed. Crank is pretty scored on cyl 3 rod journal. Advance auto has a sr20de crank kit for the g20 that come with bearings and all. Might consider this route.

https://m.advanceautoparts.com/p/cra...030%7CL3*16014
A buddy of mine bought one of these kits, had to have the crank turned and buy new bearings to get proper tolerances. If you get one, make sure you have it checked out!
__________________
tb13 is offline   Reply With Quote
Old 06-29-2017, 06:33 PM   #27
drb5721
Leaky Injector
 
Join Date: Dec 2015
Location: nc
Age: 33
Posts: 77
Trader Rating: (1)
drb5721 is an unknown quantity at this point
Feedback Score: 1 reviews
That is a bit concerning. Its certainly the cheaper option initially vs buying bearing and machining. But its more expensive if i have to do the same thing
drb5721 is offline   Reply With Quote
Old 07-01-2017, 08:25 PM   #28
drb5721
Leaky Injector
 
Join Date: Dec 2015
Location: nc
Age: 33
Posts: 77
Trader Rating: (1)
drb5721 is an unknown quantity at this point
Feedback Score: 1 reviews
Upon further inspection i see a hairline crack in the piston skirt on cylinder 2. Atleast i feel like thats what it is. There is also a weird imperfection at the bottom of the bore right where the crack is.
drb5721 is offline   Reply With Quote
Old 05-10-2018, 04:47 PM   #29
sked707
Zilvia Junkie
 
sked707's Avatar
 
Join Date: Jun 2003
Location: Los Angeles, Cali
Posts: 427
Trader Rating: (8)
sked707 is an unknown quantity at this point
Feedback Score: 8 reviews
Revive old thread! Curious on the outcome of this as I'm having similar symptoms on my ka single cam. I also swapped in a newer looking rebuilt head & started getting noise after the install. At first I thought it was lifters but now I'm thinking it might be rod bearings. I'm kinda at a loss right now. To the OP if you see this, so was it eventually the rod bearings causing the noise??
sked707 is offline   Reply With Quote
Old 05-11-2018, 01:50 PM   #30
drb5721
Leaky Injector
 
Join Date: Dec 2015
Location: nc
Age: 33
Posts: 77
Trader Rating: (1)
drb5721 is an unknown quantity at this point
Feedback Score: 1 reviews
If you have an issue with rod bearings, the noise will be present only on decel. Also, unplugging a coil/removing a spark plug boot would make the noise disappear as there is no ignition in said cylinder thus causing resistance to the rotation of the crank and rod. In my case, which is SR related, I had a few things going on. I had beat the shit out of that motor so the bearings were finally beginning to bronze from the abuse so I am thinking that some of that material was causing some blockage of the passages. I was also having the noise faintly at decel. It's hard to determine the noise and cause online but in my case, I had both a noise from the rod bearings, albeit faint due to the fact it was a material worn away versus a spun bearing, and noise from the cams from improper lubrication because of oil passage clogging. I simply picked up another SR long block with a new crank and bearings for $500 and slapped it in.
drb5721 is offline   Reply With Quote
Reply

Bookmarks


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -6. The time now is 09:11 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
vB.Sponsors
Copyright ? 1998 - 2022, Zilvia.net