How to determine if timing belt jumped a tooth

[John Roden]

I read the prior posting about pinging and the possibility of a jumped
tooth in the timing belt--My new used 240 turbo pings like that and
has a receipt for a new timing belt (out of state) so I'm wonding if
there is a way to check for this without tearing out the fan, shroud,
etc. Mostly, it pings under hard acceleration and seems to idle just
fine.

 

[Gary Heston]

I read the prior posting about pinging and the possibility of a jumped
tooth in the timing belt--My new used 240 turbo pings like that and
has a receipt for a new timing belt (out of state) so I'm wonding if
there is a way to check for this without tearing out the fan, shroud,
etc. Mostly, it pings under hard acceleration and seems to idle just
fine.

If you can see the marks on each pully, check them to verify that
they align with the reference marks on the belt.

Also, what grade of gasoline are you using? Turbos generally require
higher octange; premium at least, or super premium.


Gary

 

[James Sweet]

You can check by removing the timing belt cover, though the marks can be
difficult to see. One tooth off is all it takes to make quite a difference
in performance. Check your timing too, and make sure you run at least 89
octane gas, most 240 Turbos will ping on 87.

 

[John Roden]

Oops, I'm such a tool. I just picked it up today, gassed up with high
test and it runs great.

Since I now own a 20 year old volvo, however, I will become a regular
with this group.