2003 Volkswagen Passat Hi Just Bought 1 9 Tdi There Rattle Noise Coming Engine

2003 VOLKSWAGEN PASSAT

162,000 MILES

CORMAC

MEMBER
2 POSTS

Hi I just bought a 1.9 tdi passat and there is a rattle noise coming from the engine but once you rev the car it goes away just wondering If you think it's a big job
Thanks
Cormac

Mar 10, 2013 at 8:44 AM

MHPAUTOS

✓ASE Certified Mechanic
31,937 POSTS

These can be tricky to diagnose with out actually hearing the noise, but from what you mention i feel that it may be over head gear and engine oil pressure, i feel it is time to talk to your local mechanic and let them have a listen to this one.

Mar 10, 2013 at 11:05 AM

EXOVCDS

✓ASE Certified Mechanic
1,883 POSTS

Check the Alternator belt Tensioner for excessive rattle at idle... have someone rev the engine while you look at the tensioner.

If the tensioner roller moves LESS above idle speeds, then you have a one-way-clutch failure of the alternator.

If you can get to the alternator, you can check the clutch while it is still in the car: (this clip also shows the tensioner vibration / rattle)

http://www.youtube.com/watch?v=c_SDQiTT2sg

Here is what a good clutch / fan tests like in the car (engine off):

http://www.youtube.com/watch?v=hrgKsQXDdo8

This is how to remove the clutch pulley: (Golf TDi as sample).

http://www.youtube.com/watch?v=L3s0IVhLVto

Thomas

Mar 10, 2013 at 5:47 PM

Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.