as i said in this thread before, the scorpio is suffering from high engine noise & vibration. even the NVH of a tempo seems to be better now. it has done 1.9 lakh kms till now.
it was taken to the A.S.S & they have "assumed" two causes-
1) it needs a fuel pump servicing which costs 7-8k.
2) the timing chain along with pulley (mine is the older model & does not have the new timing belt) needs replacement at 20k.
i feel the engine foundation/mounts needs replacement too (that can be the cause of the vibrations inside the cabin). 1.5 years back, when the car was in mumbai (before it was sent to kerela), the mumbai's A.S.S had also told us the mounts need replacement. strangely, the mahindra A.S.S in kerela feels that it is not necessary.
another problem is that the A.S.S does not guarantee that doing the above will reduce the noise & vibration. the A.S.S recommended us NOT to change the timing chain right now since it is expensive & changing it may not solve the issue.
i need your suggestion guys. what do you think?
1) will a fuel pump service solve the noise & vibration issue?
2) should the engine mounts be changed?
3) is it necessary to change the timing chain? it has already been changed once in mumbai at about 80,000 kms.
I too think it has nothing to do with Fuel Pump. Otherwise the engine should be in a pathetic condition. In such case you will have a deep impact on the FE. I would also suggest you to check the mounts first. A bad engine mount can result in vibration for sure.
Only if this doesn't solve the problem, you move to timing chain. Regarding this, read the below extract:
Torsional oscillations of engine camshafts induced by valve train loads can cause significant tension fluctuation in the timing chain and magnifies the chain transverse vibrations. This will result in an increase of the undesirable impact noise from the chain/sprocket meshing process, and the knocking noise from the interaction between the vibrating chain and the guides.
So, it makes sense to make a cross examination of timing chain and its assembly.
However, I have a feeling that at least one of your engine cylinders needs service. Some 6 years back I had the same issue with M&M Jeep and I had to replace the piston rings and re-polish the cylinder units. Before doing any major service at A.S.S, its a nice idea to visit a well known local mechanic too. Some of the unskilled & untrained mechanics (as claimed by authorized service centers) are really good at spotting the issues quickly.
Hey Raj am no expert here to suggest about these but one thing from my side! We experienced the same problem in our Safari , vibration noise when in idle but no vibrations when running. But also no exterior vibrations of the body of the car just inside the bonnet.
We found out that the plastic cover plate which is fitted on top of the engine was making that noise! After tightening it the noise disappeared!! Is this plastic placed on top of your engine also?? If so then this may also be the issue!
spoke to the service advisor at mahindra's A.S.S in kerela just now. according to him, the main issues are-
1) engine mounts need to be changed- Rs. 2500
2) Fuel pump kit needs to be replaced- Rs. 7000
3) Timing pulley assembly needs to be replaced- Rs. 18,000
all figures are approximate.
out of these, (1) & (3) needs to be done ASAP & only if we need more improvement, (2) should be done.
Timing pulley assembly is not in stock & they have ordered it in mahindra & cannot say a definite date when it will arrive!!! anyways, they have already ordered it & will call us when the part arrives from the factory.