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76 R75/7 brand new heads and loud ticking?
- Thread starter skittlz74
- Start date
pauls1150
MOA #24991, south of Los Angeles
As SaltyDog suggests, but in more detail -
1) Grab the connecting rod, and see if it wiggles at all in the "in and out" direction. Note that the "bottom" end of the con rod, riding the crankshaft, is attached with two bolts. There are also two bearing shells between the con rod and the crank. Anything more than one RCH is too much.
2) Grab the connecting rod, hold the piston absolutely still, and wiggle in and out again, this time feeling for play at the top (outer) end of the con rod, at the rod-to-wristpin-to-piston interface. Ditto one RCH.
1) Grab the connecting rod, and see if it wiggles at all in the "in and out" direction. Note that the "bottom" end of the con rod, riding the crankshaft, is attached with two bolts. There are also two bearing shells between the con rod and the crank. Anything more than one RCH is too much.
2) Grab the connecting rod, hold the piston absolutely still, and wiggle in and out again, this time feeling for play at the top (outer) end of the con rod, at the rod-to-wristpin-to-piston interface. Ditto one RCH.
Yeah I just tried that again and it doesn’t budge!
Guess I should add, this engine is really strong and runs great otherwise.
gtgt_bangbang
New member
yeah but have you LISTENED to what the right side is trying to tell you ?
A horse whisperer heard nothing that wasn't said
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btw
if it aint flat broke, dont fluff fix it
kinterridge
Member
Any chance something is contacting the valve cover itself? Maybe some tell tale sign on the back side? You mentioned not hearing it with them removed, just grasping at straws I guess.
the insides of the covers are clean and no signs of anything bumping
i also got one of those cheap stethoscopes today and i still cannot pinpoint the noise. gonna keep trying!
Rocker arm end play, perhaps?
When parked for a week or more, my R75/5 makes a ticking noise for a few seconds until the oil reaches the rocker. Maybe you could consider an oil pressure deprivation on one of the noisy side rockers. In the same region, could it be a rocker arm roller bearing going bad?
When parked for a week or more, my R75/5 makes a ticking noise for a few seconds until the oil reaches the rocker. Maybe you could consider an oil pressure deprivation on one of the noisy side rockers. In the same region, could it be a rocker arm roller bearing going bad?
Rocker arms are nice and tight in perfect spec. The needle bearings look like new and there isn’t any play.
Plenty of oil coming through as I ran it with he cover off!
Actually the ticking is louder under load. And worse as it warms up.
I'm even going to switch rockers to other side today to completely rule them out. After that, I just don't know what to do.
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When you’ve got everything back together and running, if it still makes noise try advancing the timing a degree or two. When your bike was new, gas was not a problem for its high compression pistons. You have restored compression but now gas is a problem for high compression engines. Under light throttle ignition knock is a soft tapping sound. Hard throttle can produce a noise like a loud rattle. Scary sound. For several reasons, the knock can be on one side only.
gtgt_bangbang
New member
salty dawg nose . cc them heads
do some good gas before delving further
I aint a doctor but
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melville
Member
Actually, try retarding the timing a degree or two. Also check the timing on both sides individually with a timing light. My /6, when it had points, would have quite divergent timing on each side because the nose of the cam where the advance mechanism mounted had a .005" wobble. To the point that one side would show F in the timing window at full advance and the for the other side the F would be out of the window.
guenner
Member
Since it seems that nothing is wrong with the motor mechanically, maybe the noise comes from somewhere else, like the exhaust system.
I remember one day after having everything reassembled, I did a test ride and got a shocking noise and metal banging. Forgot to tighten the screws of the crossover pipe between the headers.
I remember one day after having everything reassembled, I did a test ride and got a shocking noise and metal banging. Forgot to tighten the screws of the crossover pipe between the headers.
