240d ENGINE NOISE

Start-up from cold. What is the tapping noise?

Category:

Autos & Vehicles

Tags:

• 240D
• engine
• noise

[MrQXR]

Sounds like the camshaft to me but if the mileage on the car is 250k and your getting blow-by,looks like the engine needs a full overhaul.

[fgibbon]

Thanks MrQXR. To overhaul or to swap? That is the question. Head will come off first though, out of curiosity. Then we shall see what we shall see!

[fgibbon]

Thanks Junladia - I'll go and look at that again. I've done it a few times already so maybe I'm getting it wrong everytime! Practice makes perfect!

[ellieysama]

Hmmm i can hear the tapping too what is it an Inline 4 or 6? and what year is the vehicle, i may not know alot but it sounds like something is loose inside the engine or about to come loose.

[fgibbon]

Thanks for the comment. It's a '4 pot'. 1982. It sounds 'high up' i.e. from the head?. Theories range from piston slap to tappets/rockers, camshaft, camshaft bearings, worn valve cap nuts or injection prechambers. It's been like that for years! It's very distictive - someone out there may have had the same problem. Oh yeah, there's a fair bit of blow-by also when the oil cap is removed - but not too much oil burning though. Mileage is 236K. Hmmm!

[BSCHOPPER8787]

THIS MOTOR IS STILL OK FOR 60K AT LEAST

[cfbrodierice]

It sounds like injector knock to me. I would feel each injector line and see if you can differentiate between them. One line may have a distinctive tap feeling on it.

[garrett6699]

If you have blowby the only problem that wouldn't get ruled out is piston slap. My d16y7 in my car has made a similar moise for 3 winters now. Slaps for about 10 seconds after starting them goes away.. I think mine is more oil pump related since I dont burn oil and I have good compression. The blowby is probably from bad valve seats/seals. Those motors are pretty high compression They tent to leak with age. Just let it warm up nice before you drive it and it should be good for a while.

[tommysbrowncaddy]

What year is this lovely Cadillac??

[420mass420]

do you like ford?

[popmarter]

This racket used to wake the dead every morning ,you would never need an alarm clock,the scrap yard is only 5 miles away ill give you directions.

[VAJOWLES]

mine sounds the same when itscold. its has 231kmi on it so far. yours sounds just fine.

[steveeaa]

It's a piston. Check for a stuck injector, it pees fuel into one cylinder then just trashes the rings/wall when you get on it.

It's not the fing fanbelt...

[50N1C800M]

lifters

[om616912]

The answer to the original question is now available under this username - see the results of stripping down the engine there. Thanks for all the suggestions and comments. The tapping / hammering was piston slap. Everything else on the engine seemed fine. A piston broke around 259,000 miles. The car now has a replacement OM616 engine and is still on the road.