97 Defender 90 Oil Problem - Defender Source
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  #1  
Old August 12th, 2016, 01:11 PM
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Ed Stacey
Defender 90 1997
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97 Defender 90 Oil Problem

I had Synthetic Oil put in last summer. Oil leaks started pretty bad. I took it in for service and they said not to use it in older trucks because its thinner and finds leaks. They replaced the Air Intake hoses cuz they were rotted. Also had to replace the Intake Manifold Gasket, Valve Cover Gaskets, End Seals, Oil Pan Gasket, Oil, filter, & Coolant. When I got it back it kept wanting to die at Idle and the Oil Light would flicker before doing so. I took it back and they said that the Tamper Proof Adjustment had been messed with at some point. They adjusted it and its a little better but still doesn't idle right and oil light flickers still at Idle. They said it need an Oil Pump. This truck always ran great before all of this happened. It is also eating oil. I had to put in 3 quarts of oil not long after the service and it is smoking periodically as well. Needing some advice on where to turn!


Thanks!


Ed
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  #2  
Old August 12th, 2016, 01:23 PM
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John B.
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Lots there... The synthetic probably cleaned up the engine. If it is eating oil, it is probably time for a rebuild. Start with a compression test, dry and wet to see what the rings are like.

The idle... There is a base idle as well as dynamic idle control. You need to go through the procedures in the manual to set the base idle and then check that the idle control system is working.

On the oil pressure, most likely it than it is a worn engine than an oil pump. You could pull and check the pump to see. At the same time pull a couple of bearings and see what they are like. What oil is in it now?
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Old August 12th, 2016, 05:56 PM
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You might have also clogged your oil pick up. Had the same flickering light in an older engine. Pulled the oil pan cleaned the pick up filter and tube, no more flickering light.
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Old August 12th, 2016, 10:09 PM
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Clean the pick up as mentioned. Do the cross seals at the same time. You need to get the idle right too as low idle will cause low pressure light to flicker. If that all fails, go back to regular oil 15w40 and run it until it blows.
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Old August 13th, 2016, 01:09 AM
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Baird M. Gehring
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Another often overlooked item is the oil pressure relief valve, less than a year ago I replaced my front timing cover with a good used unit because I cracked one of the oil line housings; I also took the time to replace the oil pressure relief valve o-ring as it was leaking and making the underside of my truck on the passenger side quite oily. See attached pic for oil seepage from this area where the relief valve is secured by a circlip directly above the upper oil cooler line on the timing cover. It helped to have the timing cover off the engine when I did this. Oil Pressure Pump Relief Valve O Ring Seal Circlip Kit Range Rover V8 Serp 3.9 | eBay

I also replaced the oil pump gears at this time (Rover Oil Pump Gear Kit (Same Fit As Genuine Part # OPK003) | Land Rover Engine Parts).

In very cold weather I used to have ticking from what I imagine was one of the lifters loosing prime just on the first start-up after sitting overnight, after a few moments at idle the engine would have normal oil pressure (30-40 lbs/sq. inch at 2400RPM) and the ticking noise would dissipate. This was on my new 4.6 which is very similar to the stock 4.0. While overhauling the timing cover I found that I was missing the gasket where the oil pickup tube bolts to the underside of the block. I fitted a new oil pickup tube gasket and have not had the lifter ticking issue reoccur. I would also inspect the oil pump gear retaining plate for excessive scouring, you can see how this plate can become quite worn in my attached photos.

I've tried both conventional and synthetic 10-40 and Rotella 15W50 Diesel Engine oil and can't say that I've noticed a discernable difference in performance/oil consumption/etc. I change the oil every 3,000 miles anyways, I have to top it off occasionally and I drive my D90 daily.
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Old August 13th, 2016, 08:31 AM
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if it started flickering and idling low after all that recent work,I'd suspect a large vacuum leak.
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Old August 14th, 2016, 05:30 PM
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Jake K.
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Quote:
Originally Posted by Uncle Douglas View Post
if it started flickering and idling low after all that recent work,I'd suspect a large vacuum leak.
2nd that!
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Old August 19th, 2016, 09:25 AM
estacey
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Ed Stacey
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Quote:
Originally Posted by Uncle Douglas View Post
if it started flickering and idling low after all that recent work,I'd suspect a large vacuum leak.
Could the Vacuum leak be at either the Air Intake Gasket or the Valve Cover Gasket they replaced? Plus It's eating oil and not leaking under the truck. I feel it's all related.

Thanks!

Ed
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