V8i CAMSHAFT WEAR SYMPTOMS

**WillsDisco** · 17th February 2011, 06:45 PM

G'day All,
I previously posted a question about a vibration, thinking the driveline to be the cause but it turns out an engine miss is the culprit

I read about a 'scraping noise' mentioned in a D2 post, and I have a similar noise under load as well. Like a leaky manifold gasket but more metallic sounding. The miss is there too and getting worse, though still only under load.
My local Land Rover specialist told me the camshafts in the D1 3.9 V8's wear badly in high km engines[mine 236K]and when badly worn can cause a 'miss'
Any opinions? How is a crook cam tested? I think my 'bargain' Disco may not be such a bargain after all............

Cheers Will.

**CountP** · 17th February 2011, 09:56 PM

Mmmm 'Bargain Disco' I know all about that. Got me a 'bargain' too.

**WillsDisco** · 18th February 2011, 06:43 AM

Yeah, I'm sure there are more than just you and I that have been 'bitten' by a 'bargain

Originally Posted by CountP

Mmmm 'Bargain Disco' I know all about that. Got me a 'bargain' too.

**bee utey** · 18th February 2011, 07:44 AM

I remember working on a VB Commodore 253 with a worn cam. It ran OK until you gave it stick, then the partly opening exhaust valve would cause this popping sound in the inlet as not all the exhaust gases had escaped from that cylinder. Easily identified when the rocker covers were lifted, one exhaust valve hardly lifted at all.

So I would suggest buying a cam, lifters and timing chain, gaskets: timing cover, inlet manifold and rocker cover, and rip into it. Good learning curve, should take you half a day or so. Find a learned friend with tools to assist.

**101RRS** · 18th February 2011, 09:20 AM

Originally Posted by bee utey

Good learning curve, should take you half a day or so.

Yeah rite - it is a Land Rover.

Every Land`rover designer should have to work on the products they have built.

**BigJon** · 18th February 2011, 11:02 AM

It took me nearly half a day to replace the intake manifold gasket on my 3.9. I am a mechanic by trade, although I don't work as such now. I wasn't working at a fast pace and I probably could have done it faster.

I would say replacing the cam in half a day would be near on impossible.

**jonse** · 18th February 2011, 12:34 PM

Originally Posted by bee utey

I remember working on a VB Commodore 253 with a worn cam. It ran OK until you gave it stick, then the partly opening exhaust valve would cause this popping sound in the inlet as not all the exhaust gases had escaped from that cylinder. Easily identified when the rocker covers were lifted, one exhaust valve hardly lifted at all.

So I would suggest buying a cam, lifters and timing chain, gaskets: timing cover, inlet manifold and rocker cover, and rip into it. Good learning curve, should take you half a day or so. Find a learned friend with tools to assist.

Never having been under the rocker covers of my Disco (or the previous D1 or RRC) I presume it's relatively straighforward to check valve lift with a dial gauge ?

I suspect my 200k '98 3.9 D1 may have worn cams as it doesn't feel as quick as my previous 3.9 D1 or '93 RRC both of which were under 100k.

**101RRS** · 18th February 2011, 03:42 PM

Originally Posted by BigJon

It took me nearly half a day to replace the intake manifold gasket on my 3.9. I am a mechanic by trade, although I don't work as such now. I wasn't working at a fast pace and I probably could have done it faster.

I would say replacing the cam in half a day would be near on impossible.

I replaced my 3.5 inlet manifold gasket back in May last year - the gasket itself very quick - removing all the other crap like alternators etc to make room to get at the inlet manifold. Not such an issue getting the stuff off, but getting it all back on.

**Blknight.aus** · 18th February 2011, 06:08 PM

half a day is optimistic but achievable for doing the cam on a v8.

id budget a full day for a single person with all the tools.

**BigJon** · 18th February 2011, 06:20 PM

Possibly more depending on skill levels.

I have had the cam out of a 253 with A/C in an hour flat. Rattle gun for manifold bolts, remove radiator, pivot A/C out of the way. Timing cover off, rocker covers off, rockers off, etc, etc. Still takes a lot longer to put it back together.

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