[dvinod]

Hi

I own a 2006 model esteem vxi with odo 42000 kms. On regular service the mechanic noticed timing pulley wobble and slightly touch the cover.
He changed the pulley but still the problem recurs.

The mechanic claims it may be due to crankshaft bent and it will not cause any problem. since i bought this car as used, i don't know the exact reason for the crankshaft bent. Apart from wobble, everything is normal.

Now my question is how big the problem is? Will it lead to any big engine problem? Can we change the crackshaft without dismantle the engine?

please advice me

[Catalyst_delhi]

Originally Posted by dvinod

Hi

I own a 2006 model esteem vxi with odo 42000 kms. On regular service the mechanic noticed timing pulley wobble and slightly touch the cover.
He changed the pulley but still the problem recurs.

The mechanic claims it may be due to crankshaft bent and it will not cause any problem. since i bought this car as used, i don't know the exact reason for the crankshaft bent. Apart from wobble, everything is normal.

Now my question is how big the problem is? Will it lead to any big engine problem? Can we change the crackshaft without dismantle the engine?

please advice me

Bent Crank shaft at 42k is overkill, Maybe the car has a history with the 1st owner. I think you would not be able to change the crank shaft without opening up the engine , this is mainly bottom end work but aligning the pistons would have to be done from the top. This is indeed a lot of work. I may be wrong but this is from my experiences. a little wobble is fine , you can add shims to the cover or a thick gasket to give a little minute clearance, if that would help.

[SS-Traveller]

Highly unlikely that you can bend a crankshaft and still have the engine running fine. At the very least you'd have leaking crankshaft oil seals. I would say the pulley itself (maybe not, since you changed to a new one and checked), or its mounting points/face, has been warped / damaged in some way.

A bent crank is usually due to something major that happened, wherein pistons / conrods have popped out from the engine! Your mechanic can tell if the engine is factory-assembled, or has been opened outside later on. The only way you can confirm a bent crankshaft is by dismantling the engine and running the crankshaft on a lathe to check for runout.

If the wobbling pulley is not eating up your drive belt(s) too quickly, let the wobble be.

[Sutripta]

Originally Posted by dvinod

I own a 2006 model esteem vxi with odo 42000 kms. On regular service the mechanic noticed timing pulley wobble and slightly touch the cover.

Hi,
Very unlikely you have a bent crank.

Would suggest you check out whether the pulley itself is true or not at a machine shop.

Also check the front of the crank for signs of mishandling. Like burrs or toolmarks which is preventing the pulley from fitting properly.

If car is running without problems, don't worry too much over it.

Regards
Sutripta

[nik0502]

Originally Posted by Sutripta

Hi,
Very unlikely you have a bent crank.

Would suggest you check out whether the pulley itself is true or not at a machine shop.

Also check the front of the crank for signs of mishandling. Like burrs or toolmarks which is preventing the pulley from fitting properly.

If car is running without problems, don't worry too much over it.

Regards
Sutripta

Hi,

I have a 2005 model Esteem. My car was throwing engine oil light for quite some time. Consulted M.A.S.S and they advised to change the oil pump. I gave the car to M.A.S.S for oil pump change and they also changed timing belt. The car was returned the next day but the oil pump light was still on. To this the SA replied that there is play in the crank he has checked it by opening up the bottom portion and I need to rebuild the engine. I took the car back there was indeed noise of crankshaft and it comes up only after the engine is warmed up. Now just a week after getting the work dine by M.A.S.S the timing pulley gave away. The one which is inside the cover and the car broke down. Took it to an F.N.G who fixed the pulley and said the slot to lock the pulley had widened so I have used a bigger lock and the car should not give any problems now. Took the car to M.A.S.S to check the timing as FNG did not have a timing gun. And also complained about the incident to which the SA again replied because there is play in the crankshaft thats why it happened and it's not their fault and I should get the engine rebuilt. So now the question is do I really need to rebuild the engine. The car is not loosi g oil and is giving me exeptional mileage. It's just the timing pulley has some play and making little noise but it is not eating the belt.

nIk

[(Alok)]

Attaching herewith a 4 cylinder crankshaft image (it is not of esteem). Connecting roads to be connected on the places shown with green arrow.

May anyone tell the how this will get bent? Crank shaft is not a straight road. In multi cylinder engines it is to be made as shown in image.

[nik0502]

Originally Posted by (Alok)

Attaching herewith a 4 cylinder crankshaft image (it is not of esteem). Connecting roads to be connected on the places shown with green arrow.

May anyone tell the how this will get bent? Crank shaft is not a straight road. In multi cylinder engines it is to be made as shown in image.

Hi Alok,

If you are referring to my post in my case it is not bent, but as per M.A.S.S. it has play in it and makes a noise when the engine is warmed up.

nIk

[Sutripta]

Originally Posted by nik0502

Now just a week after getting the work dine by M.A.S.S the timing pulley gave away. The one which is inside the cover and the car broke down. Took it to an F.N.G who fixed the pulley and said the slot to lock the pulley had widened so I have used a bigger lock and the car should not give any problems now.
nIk

Lots of questions. How did the pulley give way? How was it fixed?

Pulley should not be loose/ make a noise. The key slot in both the pulley and the crank will get damaged. Pulley is cheap, crank is not.

Originally Posted by (Alok)

May anyone tell the how this will get bent?

A bent crank means centreline not true.

Regards
Sutripta

[nik0502]

Originally Posted by Sutripta

Lots of questions. How did the pulley give way? How was it fixed?

Pulley should not be loose/ make a noise. The key slot in both the pulley and the crank will get damaged.

Regards
Sutripta

The key which locks the pulley developed some issue. This was just after few KMs after MASS had changed the timing belt. So I suspect they didn't lock it probably.

nIk

[Sutripta]

^^^
And what did the FNG do?
Any pictures?

Regards
Sutripta

[nik0502]

Originally Posted by Sutripta

^^^
And what did the FNG do?
Any pictures?

Regards
Sutripta

I do not have the pictures. He opened up the timing case took the pulley and key out and replaced it with an new one and installed a new belt.

nIk

[Mr.ASG]

The replacement of Oil pump is unnecessary & I highly doubt the possibility of a crank shaft bend, Crank shaft is well supported using main bearings in engine block. However worn out main bearing can cause oil pressure warning lights to light up.

Originally Posted by nik0502

Hi,
So now the question is do I really need to rebuild the engine. nIk

Unless engine is not burning any oil that won't be necessary

Originally Posted by nik0502

Took it to an F.N.G who fixed the pulley and said the slot to lock the pulley had widened so I have used a bigger lock and the car should not give any problems now.

nIk

If the sound is due to pulley not being locked properly, this will help. Yet I have doubts about the oil pressure warning light.

[Sutripta]

Originally Posted by nik0502

I do not have the pictures. He opened up the timing case took the pulley and key out and replaced it with an new one and installed a new belt.

nIk

'It' = key, pulley, or both?

I have a feeling that the key slot has become wedge shaped, and if so, will continue to get worse.

Regards
Sutripta

[nik0502]

Originally Posted by Sutripta

'It' = key, pulley, or both?

I have a feeling that the key slot has become wedge shaped, and if so, will continue to get worse.

Regards
Sutripta

Yes both. And yes about the slot. He said that he had to use some oversized key. What is the solution now?

nIk

[Sutripta]

Originally Posted by nik0502

What is the solution now?

New crank
Remachining slot in old crank
Juggad and prayer.

An intelligent juggad approach would be my first approach.

Regards
Sutripta