hoopfish

Well-Known Member

• Dec 13, 2014

• #1

Morning lz, I have a 300tdi auto and as the title says I have just noticed a loud ticking noise coming from the engine. It appears to be coming from the back of the air con?. The air con is not in use, has not worked for years. The noise is between the fuel pump and the front of the air con unit,I think. It speeds up with the engine.
Any ideas what this could be?
Regards
Terry.

 

Pikey

Dummy Ejection Facilitator..

• Dec 13, 2014

• #2

The aiorcon belt tensioner pulley??? remove the aircon belt & that'll remove one option.

 

hoopfish

Well-Known Member

• Dec 13, 2014

• #3

Morning pikey,it has no belt fitted!.

 

Dippypud

Never Knowingly Understood

Full Member

• Dec 13, 2014

• #4

hoopfish said:

Morning lz, I have a 300tdi auto and as the title says I have just noticed a loud ticking noise coming from the engine. It appears to be coming from the back of the air con?. The air con is not in use, has not worked for years. The noise is between the fuel pump and the front of the air con unit,I think. It speeds up with the engine.
Any ideas what this could be?
Regards
Terry.

Click to expand...

Sound not coming from further back?

Lift pump maybe? other than that A/C pulley bearing ...

 

hoopfish

Well-Known Member

• Dec 13, 2014

• #5

Dippypud,it might be. If it was the lift pump would I be able to feel it knocking?

 

james6546

Well-Known Member

• Dec 13, 2014

• #6

hoopfish said:

Dippypud,it might be. If it was the lift pump would I be able to feel it knocking?

Click to expand...

Use a long handled screwdriver, listen to the handle end and put the screwdriver end against the lift pump. You should be able to tell then.

My 90 had a similar noise, turned out to be the head gasket blowing at the back of the engine.

 

hoopfish

Well-Known Member

• Dec 13, 2014

• #7

Just tried that James,it all sounds pretty much the same.I tried it on the rocker cover,lift pump and back of the air con unit. It didn't start ticking when I started it up,took about a minute to get going!.

 

jamesmartin

Well-Known Member

• Dec 13, 2014

• #8

has air con compressor still got belt fitted, vac pump is another likely cause

 

hoopfish

Well-Known Member

• Dec 13, 2014

• #9

No belt fitted James,it's a very metallic noise almost tappets!.

 

jamesmartin

Well-Known Member

• Dec 13, 2014

• #10

id think from what you say tappets,vac or lift pump, if you remove vac to try it hold some cardboard etc over hole to stop oil splashing everywhere

 

D

Dafman1990

New Member

• Dec 13, 2014

• #11

Do you know if/when it last had a timing belt, that's in the same area and could be making a noise if one of the idlers has gone causing the belt to be slack

 

Y

YOREVOL

Active Member

• Dec 13, 2014

• #12

try the fuel lines, sounds daft but my old 300tdi started with a loud ticking noise then proceeded to start cutting out. fitted a new lift pump but still noise and losing power/cutting out. found the fuel lines were gummed up, blew them out and all was well again.

 

hoopfish

Well-Known Member

• Dec 14, 2014

• #13

The ticking has gone this morning???????