Timing belt 3B

[Palin]

This has surely been discussed somewhere before, but i can’t seem to find any viable answer.

Stock timing belt is coming up a little on the slack side after head and bottom was levelled. Anyone got tips for a different, shorter belt?

[s2driveruk]

Are you not able to achieve the tension through the waterpump adjustment?

[Palin]

Are you not able to achieve the tension through the waterpump adjustment?

Unfortunetaly not, still a good amount of slack when maxed out.

[s2driveruk]

Any idea how much they took off? Sounds like you might need a bigger head gasket. Definitely sure you have the right belt too?

[AndyP]

Buy a new tensioner roller and give it to a good machine shop, ask them to make a press on sleeve to increase the outer diameter. Done this before on a stroker engine using a 3B water pump.

[SteveH]

I would use a thicker head gasket or you may be very close between the valves and piston valve pockets. Your CR will also be raised.

[Palin]

Any idea how much they took off? Sounds like you might need a bigger head gasket. Definitely sure you have the right belt too?

Not sure how much exactly, but they said it wasn’t a lot. I’ve heard others had issues with the 3B belt being a little slack when OEM, makes sense it would slack more after a little machining.

[Palin]

Buy a new tensioner roller and give it to a good machine shop, ask them to make a press on sleeve to increase the outer diameter. Done this before on a stroker engine using a 3B water pump.

We found a belt pretty much identical to the 3B one, from an Opel. One tooth shorter and 1mm wider, we’ll try that one, should work. If it doesn’t, we’ll try the press on solution since i’ve got a spare roller laying around.

Gates 5367xs for the record.

[Palin]

I would use a thicker head gasket or you may be very close between the valves and piston valve pockets. Your CR will also be raised.

All the clearances was checked and OK, so that should be no issue. CR is less of an issue since i’ll be running a special E85 fuel!

[AndyP]

We found a belt pretty much identical to the 3B one, from an Opel. One tooth shorter and 1mm wider, we’ll try that one, should work. If it doesn’t, we’ll try the press on solution since i’ve got a spare roller laying around.

Gates 5376xs for the record.

Are you sure on that number? According to this the 5376xs belt is 226 teeth by 30mm wide??

https://www.motor-doctor.co.uk/produ...48-timing-belt

Found it, it should be 5367xs

https://www.gatesautocat.com/p/power...es/5367xs.html

[Palin]

Are you sure on that number? According to this the 5376xs belt is 226 teeth by 30mm wide??

https://www.motor-doctor.co.uk/produ...48-timing-belt

Oops, tossed the numbers around! 5367xs it is.

[AndyP]

Some good information here on the various cambelts.

https://www.s2forum.com/forum/technical/engine-and-turbo/76019-stroker-cambelt-guide