Oil pools on all piston tops - Page 2 - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Jrguzman · 04-16-2018, 12:14 PM

Quote:

Originally Posted by tuzzio

Unless I misread, I'm going to re-iterate the same issue I had was valve guides.

Do you know how exactly they failed? Too much stem to guide clearance? I'm trying to figure out how they could fail after the machine work

tuzzio · 04-17-2018, 08:08 AM

Quote:

Originally Posted by Jrguzman

Do you know how exactly they failed? Too much stem to guide clearance? I'm trying to figure out how they could fail after the machine work

Yes, the machine shop replaced all of them.

Jrguzman · 05-04-2018, 02:11 AM

Quick update:

Took the head to a different machine shop to get the head checked, mainly the guides.

Pulled the oil pan off and took the pistons out to check the rings.

I found only the top ring on the number 1 piston was broken and the are some light scuffs on the cylinders. A little detonation damage at the top of each piston on the Intake side ( just like the head). So I had the shop check the pistons out as well.

The second machine shop ended up not wanting to mess with the head and said the pistons were okay. So off to machine shop number three.. I asked them if they would check the valve guides.

Also I ordered new rings for all the pistons just because I'm in this far. The second machine shop thought I might have lost tension in the rings.

***S14DB*** · 05-06-2018, 01:45 PM

The 3rd ring is your oil control ring. You engine isn't even broken in.

Jrguzman · 05-06-2018, 04:45 PM

I am going to re ring it while I have it apart
What would you recommend for ring gaps?
It is .015 right now for the top ring

tuzzio · 05-07-2018, 08:05 AM

My wisecos came with a formula to calculate the gaps.

Mine are .018" and .020

Jrguzman · 05-20-2018, 06:13 PM

So I'm going to gap the rings a bit more than last time. The third machine shop said the guides and the rest of the head was In order. So I'm thinking it must be the rings. Going the ball hone with a 240 grit on all the cylinders to help the rings seat. Will update when I get it back together

Weksan · 05-28-2018, 01:11 PM

Interested in this as well. I'm having the same issue but with a sr20det. Puffing out blue smoke, oil in exhaust ports, 165 compression across the board. I had the machine shop put new exhaust guides and seals in. I'm also using a tomei headgasket. Keep this updated please.

05-06-2018, 01:45 PM	#34
*S14DB* AFC #1 Join Date: Oct 2003 Location: 昨晩あなたのお母さんの家 Posts: 20,181 Trader Rating: (3) Feedback Score: 3 reviews	The 3rd ring is your oil control ring. You engine isn't even broken in. __________________ Comments should be taken as Opinions not as Statements of Fact

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

05-04-2018, 02:11 AM	#33
Jrguzman Leaky Injector Join Date: Feb 2017 Location: Hayward Age: 33 Posts: 56 Trader Rating: (0) Feedback Score: 0 reviews	Quick update: Took the head to a different machine shop to get the head checked, mainly the guides. Pulled the oil pan off and took the pistons out to check the rings. I found only the top ring on the number 1 piston was broken and the are some light scuffs on the cylinders. A little detonation damage at the top of each piston on the Intake side ( just like the head). So I had the shop check the pistons out as well. The second machine shop ended up not wanting to mess with the head and said the pistons were okay. So off to machine shop number three.. I asked them if they would check the valve guides. Also I ordered new rings for all the pistons just because I'm in this far. The second machine shop thought I might have lost tension in the rings.

05-06-2018, 04:45 PM	#35
Jrguzman Leaky Injector Join Date: Feb 2017 Location: Hayward Age: 33 Posts: 56 Trader Rating: (0) Feedback Score: 0 reviews	I am going to re ring it while I have it apart What would you recommend for ring gaps? It is .015 right now for the top ring

05-07-2018, 08:05 AM	#36
tuzzio Post Whore! Join Date: Oct 2013 Location: Western Mass. Posts: 2,604 Trader Rating: (3) Feedback Score: 3 reviews	My wisecos came with a formula to calculate the gaps. Mine are .018" and .020

05-20-2018, 06:13 PM	#37
Jrguzman Leaky Injector Join Date: Feb 2017 Location: Hayward Age: 33 Posts: 56 Trader Rating: (0) Feedback Score: 0 reviews	So I'm going to gap the rings a bit more than last time. The third machine shop said the guides and the rest of the head was In order. So I'm thinking it must be the rings. Going the ball hone with a 240 grit on all the cylinders to help the rings seat. Will update when I get it back together

05-28-2018, 01:11 PM	#38
Weksan Join Date: May 2018 Location: CA Posts: 9 Trader Rating: (0) Feedback Score: 0 reviews	Interested in this as well. I'm having the same issue but with a sr20det. Puffing out blue smoke, oil in exhaust ports, 165 compression across the board. I had the machine shop put new exhaust guides and seals in. I'm also using a tomei headgasket. Keep this updated please.