Hello all,
From what I know is that it sounds like a chain that is dragging and that this ticking/knocking occurs at about 3000rpm. Above this it mostly disappears.
It is caused by certain rpm which causes the lot to vibrate at it's own frequency (resonance). Be aware that if you do not fix this the rod might snap due to the high frequency resonance caused by the excessive free play. (mine did once: it destroys the whole engine as the rod was visible from the outside...)
You can determine which rod it is by listening using a stetoscope. If you don't have one use a screwdriver and hold it against your ear (not the sharp side you dummy!). This guides the engine sounds to your ear.
Although this can help you, sometimes it is not simple to determine which one is bad (could be more than one).
There is only one way to be sure: check it by disassembling the engine, at least a part of it.... sigh!
CHECK THROUGH THE BOTTOM SIDE OF THE ENGINE:
- Remove the exhaust
- Remove the oil pan and oil tubes so you can access the big ends
- Remove the big end caps.
- With a little effort you can check the free play of the piston pens (JUST AN INDICATION!!). Try to move the rods (not the pistons up and down): there should be no noticable free play. If there is: see the text below. Free up a weekend...
ALL THE WAY:
The easiest way to remove the head without annoying yourself and damaging the frame and engine is to pull the engine. Ask a friend to help you with this.
How do I do this:
- strap the bike!
- tape the frame to prevent scratches
- put a wide flat jack under the engine.
- remove the bolts
- one person "sits" on the bike and guides the engine.
- the other will lift the front of the engine a bit (with the jack) and pulls it A BIT sideways (front), enough to free the drive shaft on the back
- then pull out the engine
DO CHECK ALL FOUR RODS! I once found a bad rod, repaired it and put the bike together again. After starting it I realized that I only solved part of the problem and had to start all over again...
Be carefull to put the oil seals/rings back in correctly as I mentioned earlier.
Don't be cheap using old seals.
Patrick Kuyper
Vmax Club Holland
The Netherlands
-----Original Message-----
From: Bill D. Miller [mailto:[EMAIL PROTECTED]]
Sent: zaterdag 29 juli 2000 1:46
To: V-MAX TECH LIST
Subject: Chain tensioner
Date: Fri, 28 Jul 2000 12:13:41 +0200
From: [EMAIL PROTECTED]
In my experience this is not the cam chain, but a piston pin (small end)
wearing out. I have seen many maxes with this problem (30+) which have been
into my garage for repair, including my own. Mostly right side.
Anyway, check the rods. Fairly simple to do.
Patrick Kuyper
Vmax Club Holland
The Netherlands
Patrick -- what is the procedure for checking for worn piston pins (small
end)? Shorting each plug in turn and listening for a reduction in the
rattling noise? Or something else. Do you need a stethascope (like medical
folks use) to amplify the sound or is it easy to detect?
Thanks , Bill
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