L71 Head Issues
Thread Starter
Drifting
Joined: Nov 2001
Posts: 1,658
Likes: 25
From: Rochester Minnesota
L71 Head Issues
As part of my restoration, I wanted new crank seals on the engine. I let the engine guy talk me into taking the heads off (engine was running fine and had been rebuilt about 15 years and 1000 miles ago). He found one piston pretty much free of carbon and suspected the valve guide was leaking water. He then pressure check the heads and found both heads showing leakage around the exhaust valve seat on one end of heads (same valve on both heads).
At the time of the rebuild, I had inserts put in to avoid problems with non-leaded fuel. Maybe a bad decision.
The current engine guy has found a pair of correct heads (without inserts) that supposedly have been magnafluxed and pressure tested for $3000!!!!!!!!!!!!!!!!
I wonder if putting new inserts in with some high temp sealant might solve the problem. That of course assumes a little water is a problem (I won't be driving car more than 500 miles a year when it's back together).
I'm looking at using:
http://http://www.northernautoparts.com/ProductDetail.cfm?ProductId=3569
Or
http://https://www.fastenal.com/products/details/0608689
Has anyone got a better idea other than spending another $3000?
At the time of the rebuild, I had inserts put in to avoid problems with non-leaded fuel. Maybe a bad decision.
The current engine guy has found a pair of correct heads (without inserts) that supposedly have been magnafluxed and pressure tested for $3000!!!!!!!!!!!!!!!!
I wonder if putting new inserts in with some high temp sealant might solve the problem. That of course assumes a little water is a problem (I won't be driving car more than 500 miles a year when it's back together).
I'm looking at using:
http://http://www.northernautoparts.com/ProductDetail.cfm?ProductId=3569
Or
http://https://www.fastenal.com/products/details/0608689
Has anyone got a better idea other than spending another $3000?
Team Owner
Joined: Feb 2003
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From: Sitting in his Nowhere land Hanover Pa
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What does your engine builder suggest. My history with engine builders and going the cheap way out never works out to well. I am no head expert but why can't they be fixed without using the inserts?
Thread Starter
Drifting
Joined: Nov 2001
Posts: 1,658
Likes: 25
From: Rochester Minnesota
To put in hardened inserts for un-leaded gas, a machine cut was needed. Evidently, the water passage is close to the exhaust valve and the machine cut got too close to the water passage-------------thus the leak.
Team Owner
Joined: Oct 2000
Posts: 38,897
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From: Washington Michigan
Thread Starter
Drifting
Joined: Nov 2001
Posts: 1,658
Likes: 25
From: Rochester Minnesota
Thread Starter
Drifting
Joined: Nov 2001
Posts: 1,658
Likes: 25
From: Rochester Minnesota
