Wrist pin issue -- Was: Ris pen issue

KeelanWiese · 02-12-2010, 05:32 PM

I am thinkin about trading my old 944 for a late 80's turbo supra. he said it has some top end ticking around 3K rpms. and was told it was a ris pen issue, any ideas? serious issue? what am i getting into if i bust out the tool box

cre · 02-12-2010, 05:54 PM

That would be "wrist pin"... it's the pin which holds the connecting rod to the piston. Not a common problem and as such I'm quite doubtful of the diagnosis... if it is accurate count on a full rebuild.

Have you seen this vehicle in person? Is the noise high in pitch or deep? Is it louder than a ticking clock?

KeelanWiese · 02-12-2010, 06:01 PM

Yeah its a good loud click in the top end, the motor was pretty well built and runs and drives well, it just gets come noise when you get up on the rpms. so a full rebuild? mmk. im not a toyota pro, though my buddies are. any other common issues it could be?

cre · 02-13-2010, 07:38 PM

I just said full rebuild if it is a problem with a shot wrist pin as getting to that would require pulling the engine and the head... you'll already be half way there. You didn't even mention this was already rebuilt. What makes you think this was a well built engine? Have you listened to the noise yourself?

The "common" causes of ticking and knocking in the 7M is bad valve lash (a constant, light ticking which increases with the RPM), injector ticking (sounds a lot like the valve tick) and rod knock. It could be a wrist pin or piston slap, but they're not common. Another thing worth checking is to make sure all of the belt pulleys are securely mounted... a loose harmonic damper makes a lot of racket.

To diagnose it yourself, get a stethoscope and track the sound. If it's bottom end noise, start pulling plug wires to find which cylinder has the problem; top end, listen directly to the injectors and then pull the valve covers and inspect the cam clearances.

If you're unfamiliar with diagnosing these things you should just take it to a mechanic you trust for a solid diagnosis; Especially if this is going to be your only car.

02-12-2010, 05:32 PM	#1
KeelanWiese Stock Join Date: Feb 2010 Location: WA Posts: 2	Wrist pin issue -- Was: Ris pen issue I am thinkin about trading my old 944 for a late 80's turbo supra. he said it has some top end ticking around 3K rpms. and was told it was a ris pen issue, any ideas? serious issue? what am i getting into if i bust out the tool box

02-12-2010, 05:54 PM	#2
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	That would be "wrist pin"... it's the pin which holds the connecting rod to the piston. Not a common problem and as such I'm quite doubtful of the diagnosis... if it is accurate count on a full rebuild. Have you seen this vehicle in person? Is the noise high in pitch or deep? Is it louder than a ticking clock? __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

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02-12-2010, 06:01 PM	#3
KeelanWiese Stock Join Date: Feb 2010 Location: WA Posts: 2	Yeah its a good loud click in the top end, the motor was pretty well built and runs and drives well, it just gets come noise when you get up on the rpms. so a full rebuild? mmk. im not a toyota pro, though my buddies are. any other common issues it could be?

02-13-2010, 07:38 PM	#4
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	I just said full rebuild if it is a problem with a shot wrist pin as getting to that would require pulling the engine and the head... you'll already be half way there. You didn't even mention this was already rebuilt. What makes you think this was a well built engine? Have you listened to the noise yourself? The "common" causes of ticking and knocking in the 7M is bad valve lash (a constant, light ticking which increases with the RPM), injector ticking (sounds a lot like the valve tick) and rod knock. It could be a wrist pin or piston slap, but they're not common. Another thing worth checking is to make sure all of the belt pulleys are securely mounted... a loose harmonic damper makes a lot of racket. To diagnose it yourself, get a stethoscope and track the sound. If it's bottom end noise, start pulling plug wires to find which cylinder has the problem; top end, listen directly to the injectors and then pull the valve covers and inspect the cam clearances. If you're unfamiliar with diagnosing these things you should just take it to a mechanic you trust for a solid diagnosis; Especially if this is going to be your only car.