Re: Chain Tensioners etc.

[Allen Poole <allen@xxxxxxxxxxxx>]

Hey Tom -

Thanks for your detailed thinking on my clunk.
I bet the start-up noise is the chain tensioner too... makes sense.
The puzzle is the running noise: it's the same sound as the chain  
tensioner noise on start-up. It does seem to correlate with thinner  
oil, but I'm pretty sure it's not valves. It's not the sam sound  
valves make, and besides I can hear my valves and they make what I  
think is a normal racket, not clunking.

Comments about rod bearing failure not being a known problem with my  
R1100 mill are reassuring! I'll keep monitoring, replace the chain  
tensioner when I can, and see if my clunk changes.

Best,
Allen

On Mar 6, 2007, at 11:48 AM, Tom Brown wrote:

> Unless you've run the thing out of oil or something, I would guess  
> that the noises you describe at start-up are chain tensioner  
> related.  You description sounds exactly like the noises my R1100RT  
> made at start-up.
>
> The high-temp increase in mechanical noise is caused simply  
> because  the oil is thinner and the rocker bearings are being  
> filled with thinner, hotter oil that runs out of the bearings  
> quicker so they have more room to bang around. You notice this  
> especially at idle because a lot less oil is being pumped at low  
> engine speeds.


____________________________
L. Allen Poole