10 replies to this topic

[Minimad130]

Hi all I have a problem with my 1303 engine after fitting a new fan belt. were at certain revs range I'm getting engine vibration. It's fine at low revs and fine at high revs but vibrates in the middle I'm wondering if were I squeezed the fan belt down past the bottom pulley I've damaged the pulley and put it out of balance is it possible to pop the pulley into a machine shop and just have the pulley balanced as this is the only thing I can think it could be as was running sweet before hand thanks dan

[nicklouse]

if you are running a standard pulley with rubber bonded damper then they are balanced. it you have put it out of balance then it is trash as you have caused it to come unbonded from the pulley. the chances of this are silm to Zero.

 

i would look at other problems.

[Carlos W]

How's the tension in the belt?

 

If it's over tight it'll ruin alternator and water pump bearings, I wonder whether this would give the symptoms described?

[Minimad130]

Thanks how would I tell if it is trash the only thig I've done since this problem has started is fit a new fan belt as the old one snapped what else would you be looking at thanks Dan

[Minimad130]

I have made sue I haven't over tensioned it there is a slight bit of play in the water pump but I would t call it major dan

[Spider]

The Pulley is actually a Harmonic Damper. If - IF - this is the problem and they do 'let go' usually from oil being on the Rubber in them, them I would strongly recommend NOT running the engine until it's sorted, you run the risk of a busted Crankshaft.

 

If it's only been vibrating since changing the fan belt, to narrow down the issue, take the fan belt off and go for a very short drive, if it's still there, then it could be the Harmonic Damper, if it's gone, then I'd suggest having a look at the belt itself and also the fan.

[Minimad130]

Will do will have a look at it tomorrow on my day off take the fan belt out and have a quick drive up the road and back dan

[Carlos W]

Will do will have a look at it tomorrow on my day off take the fan belt out and have a quick drive up the road and back dan

 

VERY quick.

 

Remember with the belt off you're not spinning the water pump (the alternator light should also be on)

[Minimad130]

Yeh no water pump or fan so gets hot quickly know this from when the belt snapped the first time

[nicklouse]

Yeh no water pump or fan so gets hot quickly know this from when the belt snapped the first time

erm. so before this belt change it snapped and you over heated?

[Minimad130]

Yeh litrely temp went straight up and stopped straight away dan