Hey guys,

I am new here but have been lurking for a while now. I have a 84 300dt with a ticking problem. I adjusted the valves which did not cure the problem.

The ticking only seems to arise when the car has reached operating temperature and is changes with engine speed. Sounds to be coming from the front of the engine or in the belt area.

At first I thought timing chain, which i should have checked when doing the valves, but did not. Now I am thinking maybe vacuum because I recently lost door locks and it doesn't always shut of now. Maybe 1 out of 4 don't shut off.

Is it possible for the vacuum pump to make a ticking noise that is only present when the car is warm? Or is it something else.

Thanks

change the vac pump- it can fail and drop parts onto the timing chain, causing immense damage to the engine.

do not drive it until you fix this...

to verify- use a length of wood, hammer handle, bit of fuel line or tubing as a stethoscope...

__________________
1984 123.193 372,xxx miles, room for Seven.

1999 Dodge Durango Cummins 4BTAA 47RE 5k lb 4x4 getting 25+mpgs, room for Seven.

With a faulty vacuum system the vacuum pump piston or diaphram without being loaded, working, or if the spring is weak will ride off the cam and land with a click on the down slope of the cam.
When the piston broke in my 300d I had the same sound as you describe. The click went with a new piston and all my door locks worked fast and I could shut of the engine with the key

__________________
1984 300SD turbo 126
"My true love"

God made me an atheist and who am I to question His wisdom

Have not yet checked vacuum pressure, but is it possible for the pump to produce suction if it is in fact what is ticking?

Forgot to mention that my tranny seems to be shifting at really low rpms as well unless I really give it some gas.

If it is the vacuum, is it difficult to repair/rebuild? I was thinking about ordering a kit from ********az.

is there a junkyard / pull-a-part near you? I would go get (in a different car) a vacuum pump off of another car and rebuild it. the kit is pretty simple to do. if yours is ticking, that bomb can go off any time.

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!