jhutton

I have an 84 300SD, recently i have replaced the following, motor mounts, motor shocks, rack idle bolt

when the engine is cold and you start the car, the engine does not rock at all
but after 20-30 minutes of driving and you come to a stop, the engine shakes the car

the idle seems right its a 750-800

any advice would be great i love this car

Jason

oldsinner111

Make sure you use German Hose clamps,at all hose connections.It sounds like air causing this.A hose will not drip fuel,but can let air in.I make a fresh cut in fuel hoses anytime I change filters.

TMAllison

Did you check your trans mount?

Is the trans going into 2nd at stop lights, or staying in 1st?

Beyond that, look for anything that might be in contact with the engine and the frame or body. I had a MB Tech do motor mounts on an 82 once, when he finished he set the engine down on top of the windsheild washer bottle and called it done. I hopped in when I picked it up, fired it up, and immediately turned it off. So much vibration I could hardly find the key to shut it down.

jhutton

my brother dose all the work he is a diesel mecahnic with 10+ years experience,

as for the air leaks he did check the injectors, is there another place to check?

the engine shacking is in neutral and first once rev are around 1,000 its as smoth as can be

FYI - i will get new filters and cut hoses this weekend

what about the filter in the tank is it worth changing

thanks for all the advice

oldsinner111

Fuel tank screen O-ring,Rear fuel lines.I always tighten lines so they will not move,and use German clamps.Other clamps cut into rubber lines.The only time you use US clamps is for radiator clamps,the german ones are skinny and can break off the necks.Tank screen clogged can cause bad idle too.

jhutton

thank you i will replace filters, tighten the hose and drain the tank next time its close to being empty

nother though could it be valves, i am close to my 15K miles to
adjust the valve clearance

jhutton

update, i have replaced all of the filters except the one in the bottom of the
fuel tank, also adjusted valves and they were not off much

still has the same symptoms, my brother thinks it could be the injectors
he actualy thinks its just the number 5 cylinder

what do you guys think?