Valve adjuster squashed |
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Valve adjuster squashed |
nditiz1 |
Jun 29 2020, 02:45 PM
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#1
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Senior Member Group: Members Posts: 1,177 Joined: 26-May 15 From: Mount Airy, Maryland Member No.: 18,763 Region Association: MidAtlantic Region |
So doing a valve adjustment i found #3 intake to be very loose. I started to adjust and then found this. Why/how did this happen?
Also, why are my leakdown tests consistently 20% leaking through the case? Rings? I did it cold and the engine looks to be rebuilt from how clean the inside of the heads were. |
BillC |
Jun 29 2020, 03:05 PM
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#2
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Senior Member Group: Members Posts: 535 Joined: 24-April 15 From: Silver Spring, MD Member No.: 18,667 Region Association: MidAtlantic Region |
My guess is that you got a defective adjuster screw that wasn't heat-treated properly. It's unusual for one of those to peen over like that, especially if there's no other damage in the valve train. Maybe it got beaten up when the valve lash opened up a bit.
If the leakdown is through the case, then it probably is the rings. Could be that they haven't seated properly, or maybe they're cracked. I have a borescope for checking the cylinders, if you'd like to drive down and borrow it -- you could check for scoring on the cylinder walls. |
burton73 |
Jun 29 2020, 04:53 PM
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#3
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burton73 Group: Members Posts: 3,498 Joined: 2-January 07 From: Los Angeles Member No.: 7,414 Region Association: Southern California |
My guess is that you got a defective adjuster screw that wasn't heat-treated properly. It's unusual for one of those to peen over like that, especially if there's no other damage in the valve train. Maybe it got beaten up when the valve lash opened up a bit. If the leakdown is through the case, then it probably is the rings. Could be that they haven't seated properly, or maybe they're cracked. I have a borescope for checking the cylinders, if you'd like to drive down and borrow it -- you could check for scoring on the cylinder walls. I had a set of lifters that kept mushrooming because they where not heat treated. Sad story for me. They made good on new lifters but I had to split the case and rebuild on a 3,000-mile engine. Vales would go out of adjustment all the time. This was in 1978 Bob B |
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