[Vwdiesel] Timing belt tension
LBaird119 at aol.com
LBaird119 at aol.com
Mon Jan 19 14:19:28 PST 2009
In a message dated 1/19/2009 12:57:51 PM Pacific Standard Time,
tgott at hotmail.com writes:
> What I was told when I got started in the VW diesel was to tension the belt
> so you can twist it between the cam and pump pulleys by about a 45 degree
> angle one way or the other. Much looser and the belt can loosen and skip teeth
> and much tighter and you can shred your belt.
The twist test was for gas engines. If you check the newer
manuals it say to NEVER twist the diesel belts. Surprisingly
they don't tend to skip teeth. Never saw one shreded from
being tight but it WILL wear out the pump input shaft bushing,
and cause the belt to walk off or at least to one side thus shredding
it, but it's from wear caused by overtightening the belt.
Too tight and you'll hear it "sing" whe it's running especially after
it's warmed up.
Best thign I've found is hard to describe. First is to way overtension
it, simply enough to pull ALL the slack to the tensioner, then back off
and retension. What you look for is the belt shouldn't feel tight between
the cam and the pump but it shouldn't be loose enough to have any
"flop" feel to it either. Frankly a tad loose is much safer than a tad
tight.
I had one come in at the dealer with about 140K on it. Never
had been to the dealer since new. The belt was so loose I couldn't
believe it hadn't jumped but still, it hadn't. :-)
Loren
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