Hyd lifter sticking
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Instructor
Joined: Feb 2005
Posts: 188
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From: Kearney Nebraska
Hyd lifter sticking
I have a slight knocking noise I can hear thought the carburetor while idling. It isn't coming from the valve covers but from the carb. During normal driving I can't hear it, but when I get on it I'm hearing a knock. I thought it was pinging but I've adjusted the timing down to 20 degrees total and no vacuum advance and it will still do it.
The engine is a fresh rebuild with all new bearings. It is a hydraulic roller cam. The lifters are crane part number: 13532-16
When they were taken out of the box there were a couple that were stuck down. They came unstuck after soaking a bunch but I'm wondering now if one is sticking and knocking.
Is there some test I can do to each lifter to see if it might be the problem one?
The engine is a fresh rebuild with all new bearings. It is a hydraulic roller cam. The lifters are crane part number: 13532-16
When they were taken out of the box there were a couple that were stuck down. They came unstuck after soaking a bunch but I'm wondering now if one is sticking and knocking.
Is there some test I can do to each lifter to see if it might be the problem one?
Last edited by big69; Aug 15, 2005 at 11:44 AM.
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Joined: Jan 2003
Posts: 96
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From: Austin TX
If it's a lifter you should be able to hear it through the valve covers. Use a stethoscope and listen at each rocker arm. You will be able to hear the sound easily at the sticking cylinder. If you don't have a stethoscope use an old wodden broom or mop handle. Check out the water pump. Sounds like it might be a cam timing or valve issue.
Thread Starter
Instructor
Joined: Feb 2005
Posts: 188
Likes: 0
From: Kearney Nebraska
I rechecked the timing gear to crank and the cam is 1 degree advanced. The noise over the carb did almost sound like a lifter not closing or opening on time. I have the motor apart now, so I can't use the stethoscope to listen.
The intake is leaking and since I'm removing that to reseal it, the lifters will be easy to get to. If I remove the lifters is there some test I can do to check that each one is working as it should?
The intake is leaking and since I'm removing that to reseal it, the lifters will be easy to get to. If I remove the lifters is there some test I can do to check that each one is working as it should?
Last edited by big69; Aug 15, 2005 at 11:57 PM.
