Isuzu Trooper Owners Club UK™

signetone · * Joined: 06 Dec 2005 Posts: 21 Location: Mid Wales

Sticking Hydraulic Tappets on one side.

I have flushed and changed the engine oil, after trying a product for this problem from Halfords.. I now have Mobile one oil in, to clear the problem. It's only the one side - the other is fine. It has been like this since I bought it, sounds like a diesel. Only do short trips and none at high speed.

The oil pressure seems fine, under the 85 mark.

Any thoughts please?

Thanks

Brian
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1997 Monterey 3.2 v6
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shyster · * Joined: 04 Nov 2005 Posts: 35 Location: Nelson

Brian are you sure its the tappets , if it sound that bad it may be the same problem as i had on my 3.2 trooper which was a faulty automatic timing belt tensioner .

THE QUIET ONE · Posted: Sun May 14, 2006 23:12 Post subject:

im glad to c some petrol troopers on ere
yes that could b one problem but if u dont get it hot enought
the flush might not of worked
try wynns tappet fluid asdas do it for £3.00
does the noise sound like a growl or is it ttttttttttttttttttttttttttttttttttttttttttttttt
also check spark plugs for right gap and heat range for that this also sounds like tappetty sounds i had that problem once it was my plugs
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signetone · * Joined: 06 Dec 2005 Posts: 21 Location: Mid Wales

Philp · Posted: Mon May 15, 2006 8:37 Post subject:

A leaking exhaust gasket can also make that sort of taptaptap kinda noise, it did on my V8, worth a squint to see if theres any soot marks or if you can feel a blow around the manifold.
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Phil

96 or is it a 98 Isuzu Bighorn Lotus

Chris01 · ** Joined: 13 Dec 2004 Posts: 108

Mine does this intermittantly as well, strangely it gets worse after an oil change then gets better after about 500miles. You need to get it warm, sit on the motorway at 90 for half an hour, that'll fix it Wink

signetone · * Joined: 06 Dec 2005 Posts: 21 Location: Mid Wales

kindwarf · * Joined: 01 Apr 2006 Posts: 31 Location: huddersfild

This seemes to be a common problem Mine does it for a about 20 second s on starting then quietens but does not completely go away I'v tried an aditive and I think it done some good, mine was illtreated before I got it and I dont think the oil was chainged regularly or the right grade of oil used Ive only had it a few monthes gave it a full sevice with right oil ect I will run for 3000 miles and change it again and see if it gets better.
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94 swb trooper 3.2 petrol auto

Chris01 · ** Joined: 13 Dec 2004 Posts: 108

I think we're all wasting our time, this engine seems to do this anyway, i've had mine 7 years and 80K miles and it s always done it. I have changed the oil very 5K, the noise just comes an goes. Strangely now at nearly 140k its quieter than ever.

I think the answer is ear muffs or pretend its the diesel, but don't bother stripping the top end, it'll just be money down the drain.

KENM · Posted: Mon May 29, 2006 21:47 Post subject:

Are u sure youve got hydra. taps. Most of them are shimmed n no amount of flushing is gonna cure that. Ken

sgarre13 · * Joined: 26 Jan 2006 Posts: 29

Our 1996 Monty taps like a good 'un also. I tried the Wynns tappet fix stuff but to no effect. I spoke with an oil expert I know he suggests flushes and tappet fluids are a waste of time anyway. Best to use the correct grade of oil and change regularly. He did suggest using a API-CH4 truck oil (MB Sprinters use it also) since the detergency on those type of oils is very good and lasts a long time because your average heavy truck goes for a lot longer between services, but keep well within the 10000mile interval. The detergency level helps to clean up the tappets in a more gentle way and keep the crud suspended and dispersed in the oil, unlike a flush which is basically toluene and a light oil which would flush it out, only for it to get stuck as a coagulated lump in your oil pump relief valve, and then BANG no oil pressure. I would like to know what measurable benefit sticking a coke can's worth of toluene into your engine for 10mins, as opposed to using a decent oil for 400 engine hours, actually gives you.

At the moment I'm sticking with a decent Semi-synth and 5000mile or less oil change interval. Noise died down after the last one but is coming back again now so due for another change.
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Chris01 · ** Joined: 13 Dec 2004 Posts: 108

Isuzu reccommend you use Mobil-1 0-40W as the fix for tappet noise, its a bit too expensive for me, so I just put up with the noise which isn't too bad on mine and comes a goes a bit.

sgarre13 · * Joined: 26 Jan 2006 Posts: 29

Just done another oil change with 10W40 Semi Synthetic, no flushing just straightforward drain for 20minutes and refill and new Fram (badged as Halfords) filter. Noise gone right down from the tappets. Engine sounds sweet as a nut. Very Happy

Also took the opportunity to fit a Fumoto drain valve. Seems to fit and work a treat.

Another change in 3 - 4000miles or when I hear the tapping again I reckon.

No need for Mobil 1.
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Vauxhall Monterey
It's not Jack and it's not cheese
It's just overlooked

Peterjday · *** Joined: 28 Apr 2004 Posts: 249

The 3.2 hydraulic tappet noise has been the subject of more than one previous thread.

Isuzu issued a bulletin that explained both the problem and the cure, and you can find a reference for the bulletin to download from the web and a text only transcript if you read the previous threads.

Briefly, the problem is build up of "varnish" from degraded oil in the hydraulics that cause the tappet piston to stick; (and sometimes the oil pressure relief valve[s]).

Recommendation is to use Mobil 1, and if that fails, to strip and clean (procedure described in the Isuzu bulletin). Don't expect a miracle cure. If it has taken 10 years to build up, it might take a year to break down and cure. I went down the Mobile 1 route as recommended and it does work, but it takes a long while.
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