1985 mercedes turbo problems - PeachParts Mercedes-Benz Forum

dlbrown75 · #1 08-21-2010, 09:15 AM

i have a 1985 300sd turbo. The turbo has worked fine since I bought i 6 months ago but a week ago I started hearing a belt screeching type noise. I thought it was a loose belt. Now all of the sudden The turbo is not working. The car struggles to reach 55 mph. Can finally get to that speed after driving at 3000+ rpm then shifting hard. Need any advice I can get. I am unfamiliar with these cars and engines since its the first one Ive owned. Thanks a lot

toomany MBZ · #2 08-21-2010, 09:53 AM

That screech may have been the bearing/s seizing up. If it doesn't turn by hand, a rebuild or replacement is in order.

jkubica · #3 08-21-2010, 10:08 AM

Quote:

Originally Posted by dlbrown75

i have a 1985 300sd turbo. The turbo has worked fine since I bought i 6 months ago but a week ago I started hearing a belt screeching type noise. I thought it was a loose belt. Now all of the sudden The turbo is not working. The car struggles to reach 55 mph. Can finally get to that speed after driving at 3000+ rpm then shifting hard. Need any advice I can get. I am unfamiliar with these cars and engines since its the first one Ive owned. Thanks a lot

If yours has locked up, I see them often in the PnP yards in the $50 -$70 price range. Might want to also look at the turbo oil supply.

dlbrown75 · #4 08-21-2010, 11:37 AM

The fan inside the turbo spins freely, when engine is off. Is it still seized up?

jkubica · #5 08-21-2010, 12:03 PM

Quote:

Originally Posted by dlbrown75

The fan inside the turbo spins freely, when engine is off. Is it still seized up?

Doesn't sound like a lockup. You might want to check play in the fan. There are several; threads on checking turbos

vstech · #6 08-21-2010, 06:04 PM

it could be a belt too. you may have a simple banjo bolt plugged up, and a loose belt on the alternator. the belt is screeching, and the banjo bolt is limiting the fuel for acceleration.

dlbrown75 · #7 08-26-2010, 06:52 AM

Thanks for the help. Replaced line from ALDA to banjo bolt. Banjo Bolt was 100% plugged. Cleaned that out, now she's running great. Still have screeching right before turbo kicks in?

vstech · #8 08-26-2010, 09:15 AM

screeching is commonly the alternator belt pair. you have to get CONTINENTAL matched set 10mm x 1000mm belts both have to come from the same lot or they will screech... have fun!