Squeaking valve or valve spring or ???
- Thread starter Stevehose
- Start date
I believe the eccentrics are new. What should I set the cam lash at on the cam? Isn't a .012 at the valve (which it is now) = a .010 at the cam or something due to the rocker angle? Should I try a little tighter or looser than spec to see if it changes noise?
.08
is what I remember. But a google search will tell you quick. e-12 site, I think.
tighter. Just check the clearances and look for the one that's different.
When you put the wire or Allen wrench in the adjuster, if the distance is toward the head more than others, then you found wear on the eccentric.
Did you grind the cam? Then you need oversize. An old trick was to regrind the old ones. Did the machine shop swap thinks around or put them back in the same order? Sharp valve tip?
Check the front oil bar bolt. Getting oil? Number one is known to be the last one to get oil. ( Changed the cam bearings?)
Oil weight- drop a can of STP, etc. in it.
Check the chain adjuster- pull it and check the head dimension. Sometimes on hard start-up - it gets reduced. Backfired hard with those triples?
is what I remember. But a google search will tell you quick. e-12 site, I think.
tighter. Just check the clearances and look for the one that's different.
When you put the wire or Allen wrench in the adjuster, if the distance is toward the head more than others, then you found wear on the eccentric.
Did you grind the cam? Then you need oversize. An old trick was to regrind the old ones. Did the machine shop swap thinks around or put them back in the same order? Sharp valve tip?
Check the front oil bar bolt. Getting oil? Number one is known to be the last one to get oil. ( Changed the cam bearings?)
Oil weight- drop a can of STP, etc. in it.
Check the chain adjuster- pull it and check the head dimension. Sometimes on hard start-up - it gets reduced. Backfired hard with those triples?
Looks like rocker ratio is 1.298 so a .009 almost = .012. I will try that technique at .008 to see if it changes sound and check eccentrics.
Not sure about the cam grind or the bearings but surely they did the bearings......
Oil bar works well, I did the pinch mod and I saw lots of oil coming out of each hole when cranking the engine to see if I heard any noise frm the area which I did not.
I have a new chain tensioner piston and spring but perhaps that's an area which needs further inspection. I am running 20w50 in it now.
Not sure about the cam grind or the bearings but surely they did the bearings......
Oil bar works well, I did the pinch mod and I saw lots of oil coming out of each hole when cranking the engine to see if I heard any noise frm the area which I did not.
I have a new chain tensioner piston and spring but perhaps that's an area which needs further inspection. I am running 20w50 in it now.
Scalloping....
Is what happens to a rocker pad as it wears. You can never set the clearance because it keeps changing with the scallop shape.--_-__--
Pad separation...
As the pad separates from the rocker you will get clicks and taps and squeeks.
Nothing you can do but toss in the recycle bin
Shaft OD wear to rocker ID...
once the wear surface has been eaten away the rocker starts sitting crooked on the
shaft, resulting in acute angles and high stress forces . Once it warms up and increases in size- the angle and force decreases
Is what happens to a rocker pad as it wears. You can never set the clearance because it keeps changing with the scallop shape.--_-__--
Pad separation...
As the pad separates from the rocker you will get clicks and taps and squeeks.
Nothing you can do but toss in the recycle bin
Shaft OD wear to rocker ID...
once the wear surface has been eaten away the rocker starts sitting crooked on the
shaft, resulting in acute angles and high stress forces . Once it warms up and increases in size- the angle and force decreases
Honolulu
Well-Known Member
hmmm. Not having watched the video, I'm gonna suggest another avenue: check that one or another belt isn't actually the cause of the squeak.
The check is simple and can be done a couple ways. One, a little spray of water on the pulley so the surface of the belt is wetted. Two, rub some candle wax on a running belt. Either will temporarily quiet a squeaky belt.
Make sure you keep your sleeve, fingers, arm, hand, hair, well free of moving parts. One friend that ran a finger through a VW alternator pulley, broke it pretty well. The other ran his finger through the drive sprocket on his motorcycle, now short by a joint. So do be careful around moving stuff and learn from the mistakes of others, you won't have time to make them all yourself!
Other than that, look at the cam lobes on #1 and see if the high spot has a groove worn in it. Your spray bar may be good now, but it may not always have been that way.
The check is simple and can be done a couple ways. One, a little spray of water on the pulley so the surface of the belt is wetted. Two, rub some candle wax on a running belt. Either will temporarily quiet a squeaky belt.
Make sure you keep your sleeve, fingers, arm, hand, hair, well free of moving parts. One friend that ran a finger through a VW alternator pulley, broke it pretty well. The other ran his finger through the drive sprocket on his motorcycle, now short by a joint. So do be careful around moving stuff and learn from the mistakes of others, you won't have time to make them all yourself!
Other than that, look at the cam lobes on #1 and see if the high spot has a groove worn in it. Your spray bar may be good now, but it may not always have been that way.