Engine noise
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Tourer
Joined: Mar 2007
Posts: 285
Likes: 12
From: East Tennessee
Engine noise
Just recently did a rebuild on my bike after a cam bearing went out. Big Boyzs Heads, andrew 26 cams, already had 95" flat top pistons. Got bike together Sunday and it started right up and sounded great. Yesterday after bike warmed up started hearing a knock, so I checked the adjustable push rods and they seem fine. Today bike sounded fine until it warmed up and I hear a knocking noise and then a higher pitched noise. What should I check now? I also replaced the lifters, new cam bearings and cam tensioners.
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Joined: Jun 2006
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From: King George, VA
Can you isolate where the knocking noise is coming from, i.e. low right side, upper right side, low left side, etc. A helpful means of isolating noise is to use a broom stick. Place one end against the cam chest and the other near your ear. You will be able to hear distinctive sounds this way. Touch different places on the engine to isolate sounds.
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Tourer
Joined: Mar 2007
Posts: 285
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From: East Tennessee
I was afraid to let it keep running. My thoughts is maybe a lifter or push rod. I just pulled the cam plate and everything looks fine. But one push rod looks to be adjusted out 1/2 longer than the rest.
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Tourer
Joined: Mar 2007
Posts: 285
Likes: 12
From: East Tennessee
To answer the other question, YES the outer cam bearing exploded, believe it or not I was 100 miles from home and ran it wide open home. The cage mainly came apart and stayed contained in the cam chest. VERY LUCKY I guess.
did you make sure no little pieces scored anything? just curious
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Tourer
Joined: Mar 2007
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From: East Tennessee
What would have got scored? I put new lifters in, new push rods, new cam plate and new bearings. The cams looked perfect, so unsure of what could have got scored.
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one push rod looks to be adjusted out 1/2 longer than the rest.
The 38 and 55 minute locations on this video are helpful:
Another good video:
The knock you describe sounds like what I had when one of my lifters collapsed.
Did Big Boyz do a good job for you? Thinking of using them for a cylinder bore and head porting when I go to a 95.
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