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Does any one know if you can install the cam chain tensioner, on a 2003 =
WR 250F with the head on?
--
Thank you,
J
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<P><FONT face=Arial size=2>Does any one know if you can install the cam
chain tensioner, on a 2003 WR 250F with the head on?</FONT></P></DIV>
<DIV><BR><FONT face=Arial size=2>-- <BR>Thank you,</FONT></DIV>
<DIV><FONT face=Arial size=2>J</FONT></DIV></BODY></HTML>
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J DeLay wrote:
> Does any one know if you can install the cam chain tensioner, on a 2003 WR
250F with the head on?
Huh? What, are you some kind of novice when it comes to motorbike
mechanics? Just kidding. We were all novices once.
The *only* time when you would normally be removing or installing the
cam chain tensioner is with the head on.
Both camshafts would be in place when you install or remove the cam
chain tensioner and the piston should be at top dead center on the
compression stroke, if you've been working on the cams.
But you ask such a naive question, it leads me to wonder if you should
be fooling around with your engine at all. You may be embarking on an
expen$ive adventure inside your engine if you don't learn how things
work and buy a manual.
Why are you messing with the cam chain tensioner? Do you even
understand what it does and why it is on the rear side of the engine,
instead of the front side?
As viewed from the left side of the engine, the crankshaft rotates in a
clockwise direction. The cam chain goes on sprockets on the crankshaft
and the camshafts. The camshafts turn clockwise. The crankshaft pulls
all the slack out of the front side of the chain. When you accelerate,
the crankshaft really pulls hard on the chain. When you decelerate, the
chain slackens.
You wouldn't be able to remove the camshafts if you didn't have some
extra slack in the rear side of the chain, so the engineers make the
chain longer than it needs to be. They could install a chain with a
master link to avoid using a long stroke chain tensioner, but they
don't. A master link would be too unreliable. So they go with the long
stroke spring-loaded chain tensioner.
And the cam chain tensioner takes up deceleration slack and
automatically compensates for wear. There is a spring and a ratcheting
mechanism inside the tensioner that allows the plunger in the tensioner
to extend, but won't allow it to be pushed backward when the rider
rolls off the throttle to slow down.
So, wazzup with the desire to mess with the automatic cam chain
tensioner?
Did it stop working automatically? Did somebody tell you that you could
get an aftermarket tensioner that works better than the stock
tensioner? Is your cam chain making a lot of noise?
You can look at the cam chain schematic and the cylinder schematic on
www.bikebandit.com and see the chain and the tensioner and the
camshafts and the cam bearing caps.
Are you going to remove the camshafts for any reason? You need a manual
to tell you what the timing marks are on the cams. The cam bearing caps
are what hold the camshafts in place. You need to know that you can
break a cam bearing cap if you try to torque the bolts if you haven't
degreased the bolts.
The torque specified in the manual is a *dry* torque. People have
broken cam bearing caps by trying to torque oily bolts and that means
they need a new cylinder head because the cam bearing caps are line
bored to the head at the factory.
And, you also need the manual to tell you how to install the cam chain
tensioner. A cam chain tensioner is normally bolted onto the back of
the cylinder with the spring compressed and the ratchet pawl holding
the plunger in that position. The tensioner usually has a cap on the
rear side and you remove the cap and push on the rear end of the
plunger and the ratchet allows the plunger to extend and take up all
the slack.
The neat thing about motorcycle cam chain tensioners is that they are
right there where you can get at them. I've had problems with cam chain
tensioners on cars. They are usually buried inside the front timing
cover where you have to remove the radiator and waterpump and
crankshaft damper to remove the cover to get at the otherwise
inaccessible tensioner. I used to find the plunger of my Jaguar's cam
chain tensioner in the bottom of the oil pan...
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