Installed different stock camshafts on RB25 now wont turn. - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

SethG12 · 01-16-2014, 12:00 AM

I broke some valves in cylinder 2 on my s1 rb25det s13. So I decided to buy a complete cylinder head and swap my old camshafts into it. I took the good ones out of the head with bad valves, then took the cams out of the head I just bought and put the good ones in.. I completed both intake and exhaust and got cam gears put back on and they won't turn.. At all. It seemed like I put them in correct but I am asking for advice on if there is any certain way they have to go in or anything. I did slowly work the cam holders (whatever they're called) into place but I'm stumped.

rotation3x · 01-17-2014, 07:29 PM

did you torque them to fsm specs?

G-E@Z31P · 01-17-2014, 07:52 PM

If you over-torque the head, the head warps, the camshaft binds... maybe you got the Nm mixed up with ft-lbs

Darius · 01-20-2014, 02:55 PM

Quote:

Originally Posted by SethG12

I broke some valves in cylinder 2 on my s1 rb25det s13. So I decided to buy a complete cylinder head and swap my old camshafts into it. I took the good ones out of the head with bad valves, then took the cams out of the head I just bought and put the good ones in.. I completed both intake and exhaust and got cam gears put back on and they won't turn.. At all. It seemed like I put them in correct but I am asking for advice on if there is any certain way they have to go in or anything. I did slowly work the cam holders (whatever they're called) into place but I'm stumped.

Are your pistons at TDC? If so, you could have mashed the valves into the pistons when you installed the new cams. The reason I mention this is because I broke my #6 exhaust valve this way. Always install cams with the pistons slightly lowered into the bores. Then, rotate them to the rear timing cover marks and then turn the crank a few degrees to TDC to match.

Sileighty_85 · 01-20-2014, 04:42 PM

Make sure CAM Caps are installed correctly, It is possible to install them backwards causing them to bind the CAM Shaft

01-16-2014, 12:00 AM	#1
SethG12 Leaky Injector Join Date: Oct 2013 Location: Dayton, OH Age: 30 Posts: 65 Trader Rating: (1) Feedback Score: 1 reviews	Installed different stock camshafts on RB25 now wont turn. I broke some valves in cylinder 2 on my s1 rb25det s13. So I decided to buy a complete cylinder head and swap my old camshafts into it. I took the good ones out of the head with bad valves, then took the cams out of the head I just bought and put the good ones in.. I completed both intake and exhaust and got cam gears put back on and they won't turn.. At all. It seemed like I put them in correct but I am asking for advice on if there is any certain way they have to go in or anything. I did slowly work the cam holders (whatever they're called) into place but I'm stumped.

01-20-2014, 04:42 PM	#5
Sileighty_85 Post Whore! Join Date: Dec 2006 Location: Misawa, Japan Posts: 6,815 Trader Rating: (8) Feedback Score: 8 reviews	Make sure CAM Caps are installed correctly, It is possible to install them backwards causing them to bind the CAM Shaft __________________ 後輪駆動車１番 1989 Built SR GT2871R -363whp 1998 S14 W/RB25- 250ish (For Now) 1986 SR86 - 200ish 1990 R32 GTR - 320hp Don't Buy Engines from JDM-Online http://zilvia.net/f/businesses/207457-jdm-online.html Don't Buy XS-Power or SSAC Shit

01-17-2014, 07:29 PM	#2
rotation3x Zilvia Member Join Date: Jun 2005 Location: virginia Age: 38 Posts: 272 Trader Rating: (2) Feedback Score: 2 reviews	did you torque them to fsm specs?

01-17-2014, 07:52 PM	#3
G-E@Z31P Leaky Injector Join Date: Sep 2012 Location: Toronto Posts: 126 Trader Rating: (0) Feedback Score: 0 reviews	If you over-torque the head, the head warps, the camshaft binds... maybe you got the Nm mixed up with ft-lbs