1. Home
  2. Land Rover 4WD vehicles
  3. Noisy 300TDi

Noisy 300TDi

So...the 110 passed its MOT...but the tappet noise turned out to be not a tappet! So far I have:

- inspected cam shaft followers, replaced 1 - fixed a sticky inlet valve - replaced a snapped rocker shaft - replaced cam belt and reset cam timing

Still sounds like it's got a noisy tappet. No smoking or performance problems. Spoken to a couple of 'experts' who can't offer any other ideas.

Have had a suggestion that head could have been over-skimmed causing valves to hit pistons when running (there's nothing fowling when turning engine via spanner on crankshaft). This sort of ties up with the fact that I can see (inlet only) valve marks on the piston heads, which I had previously assumed were from a snapped cambelt at some point in time. Also, badly warped head can cause the rocker shaft to snap, apparently. But....if the cause of this is down to the head being over-skimmed, why would the inlet valves be hitting the pistons but not the exhaust valves?

Anybody got any ideas / comments etc.? I'd be grateful for any helpful advice - it's starting to grind me down now.

Icky.

Reply to
icky
Loading thread data ...

A slightly leaking exhaust manifold can sound very much like a tappet!!

Nige

--

-- Subaru WRX Range Rover LSE (Bob) FOR SALE!!! Range Rover 4.6 HSE (The Tank!)

'"I don't remember asking you a goddam thing"

Reply to
Nige

In message , icky writes

There is a dowel in the end of the cam shaft that locates in the camshaft pulley. Check that this has not broken.

I have only seen it once but it gave the effect of a tappet noise as well as a popping noise that could be heard through the air intake vent on the wing.

My customer was driving it for years before allowing me to investigate the cause of the noise. It took some finding.

Reply to
Marc Draper

Marc Draper wrote in news: snipped-for-privacy@mdeng.demon.co.uk:

Just a wild card for you. I had a horrendous tapping sound from one of my Pug 504's and suspected something really bad. A mechanic suggested it was some foreign material attached to an injector, possibly carbon. Anyway, it went away as mysteriously as it arrived...

Thought I would mention it. It's not the old fan belt noise, is it? That has caught a lot!

Derry

Reply to
Derry Argue

Hi Mark I will check that this morning before i refit cam belt cover.

Cheers Icky

Reply to
icky

Your're not going to like this......... but 300Tdi's do a very good impression of a noisy tappet when the head gasket is blowing a tiny bit in the usual place (back left hand corner by No 4 Cylinder).

Sometimes you can see a tiny amount of carbon by a hole, and shining a torch there after dark can show it up, or if it's internal (i.e. to the push rod hole) you get a slight chuffing from the oil filler.

Worth a look, anyway.

Richard

Reply to
beamendsltd

Hi Derry I have been told by a 'diesel expert' that it is not a fueling noise all though i may put the injectors from my disco in just to rule them out. It have run engine without fan belt and this makes no differance

Cheers Icky

Reply to
icky

I think he has had the head off already Richard

Reply to
Marc Draper

I the heads been off no obvious signs of gasket trouble.I think i am gonna take it off again at the weekend and try putting 2 head gaskets on run briefly to see if the noise has gone before I shell out on another head all the people I have talked to seem to think the head is the most likely culprit

Cheers Icky

Reply to
icky

"icky" wrote in news:iJYMf.69936$ snipped-for-privacy@fe3.news.blueyonder.co.uk:

When you changed the head, you did either replace the head bolts or measure them to check they hadn't stretched, didn't you?

Had at least four new head gaskets put into a Peugeot 504 before the local dealer had a shot and changed the head bolts -- and put on a new head. That cured the problem.

The problem is that the head bolts can stretch so they won't take a torque. If they are stretched, there is a good chance the head will warp as well as the gasket blow sooner or later. You can check by measuring them, but it is not too expensive to replace the head bolts as routine.

Another thing, get the head checked by some independent workshop -- not one that will sell you a new head or skim it for you. I suspect I have paid to have heads skimmed that were perfectly OK simply because that is how the workshop make their money! No skim, no invoice. They like it even better if they can sell you a new head! :(

Please excuse me if I am teaching you to suck eggs!

Derry

Reply to
Derry Argue

MotorsForum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.