Post by bigshingle on Mar 27, 2008 9:40:37 GMT -5
Does anyone have any idea about what keeps the cam-chain guide screws in place?
I'm finally getting around to putting the SR's engine back together. — I just put the cam-chain guide on the cylinder (arrow up) and am about to set the cylinder in place.
I may have an over-active imagination, but the original chain guide screws are phillips-head and look like they could easily vibrate loose. I'd rather not have that happen — not ever — but especially inside a new engine.
The original screws were hard as hell to get out and took a beating, so I'm replacing them with hex-head bolts (which can be snugged down tighter than phillips-heads.)
Should I also used lock-washers? (No lock washers originally.) How about Lok-Tite?
Or am I worrying about nothing?
The bolts are steel and going into holes threaded in aluminum, so it would be easy as pie to over-tighten them and strip the threads. Oddly, these seem to be the only fasteners for which the Yamaha manual doesn't give torque specs.
It may be that as the engine heats up the difference in the expansion rates of steel and aluminum possibly causes the screws to be seized tighter (
) Otherwise, I can't see what keeps the screws from coming loose and raising hell inside the engine.
Any thoughts on this? All advice appreciated.
I'm finally getting around to putting the SR's engine back together. — I just put the cam-chain guide on the cylinder (arrow up) and am about to set the cylinder in place.
I may have an over-active imagination, but the original chain guide screws are phillips-head and look like they could easily vibrate loose. I'd rather not have that happen — not ever — but especially inside a new engine.
The original screws were hard as hell to get out and took a beating, so I'm replacing them with hex-head bolts (which can be snugged down tighter than phillips-heads.)
Should I also used lock-washers? (No lock washers originally.) How about Lok-Tite?
Or am I worrying about nothing?
The bolts are steel and going into holes threaded in aluminum, so it would be easy as pie to over-tighten them and strip the threads. Oddly, these seem to be the only fasteners for which the Yamaha manual doesn't give torque specs.
It may be that as the engine heats up the difference in the expansion rates of steel and aluminum possibly causes the screws to be seized tighter (
) Otherwise, I can't see what keeps the screws from coming loose and raising hell inside the engine.Any thoughts on this? All advice appreciated.
