Jason2

Well-Known Member

• May 20, 2019

• #1

Posting for a mate !

Who's just bought a V8 Discovery 2, approx 120k on the clock with the 4l thor engine. When he bought it a couple of months ago all was good but it has starting consuming more and more oïl . Last trip he did he used 8 liters of oïl to do 350 miles

Starts and runs perfectly, pulls like a train but smokes, has an LPG conversion that works perfectly, no oïl in coolant, coolant level stable, no strange noises or oïl leaks etc .......

He has tried different oïl's but even 20w 50 does'nt make any difference. compression test shows approx plus or minus 180 psi on all cylinders.
Thinking it might be scrapper rings ? Valve seals ? but would like to get head around how it was'nt useing any oïl and now is before going any further ??

Thanks in advance

 

kermit_rr

Very

Full Member

• May 20, 2019

• #2

For that much oil I'd say rings. Valve seals generally weep - you'll get a puff of smoke on startup after its been stood a while but normally clears after a few seconds

 

Jason2

Well-Known Member

• May 20, 2019

• #3

Cheers but Compression looks good ???

 

norseman

Well-Known Member

• May 25, 2019

• #4

Strange one this, RV8's are not known as oil burners. I had a 3.5efi with inter-galactic mileage, well down on power as a result but still only used minimal oil.
Hopefully others here will be more helpful to you.

 

Henry_b

Think outside, no box required.

• May 26, 2019

• #5

For it to losing that much oil, it's either burning it, or píssing it out somewhere..

Whats the exhaust like?

Give her a boot to redline and check the exhaust, any blue smoke?

Stem seals can leak but for it to lose that much through them it would be very apparent..

Compression seems good so unlikely to be rings.

Oh and what did the sparkers look like?

Burning oil is very apparent on plugs..

 

Jason2

Well-Known Member

• May 26, 2019

• #6

Henry_b said:

For it to losing that much oil, it's either burning it, or píssing it out somewhere..

Whats the exhaust like?

Give her a boot to redline and check the exhaust, any blue smoke?

Stem seals can leak but for it to lose that much through them it would be very apparent..

Compression seems good so unlikely to be rings.

Oh and what did the sparkers look like?

Burning oil is very apparent on plugs..

Click to expand...

Thanks for your recent replies as I’m
Absolutely stumped on this one ? Plugs look good on the left bank but on the right bank they are all black and carboned up . Runs **** on petrol and better on gas !

 

S

sassanach

Well-Known Member

• Jun 3, 2019

• #7

piston rings,been there,done that.

 

JUKE179r

Well-Known Member

• Jun 3, 2019

• #8

it does sound like worn piston rings with your carboned plugs.
and clean out your plastic PCV valve.... I tell everyone to do this regardless.

 

S

Spindall

Active Member

• Dec 11, 2022

• #9

Epic thread revival....
I now have the same symptoms.
Did you ever discover the cause?

 

R

Ratae

Well-Known Member

• Dec 11, 2022

• #10

OP last logged in May 2020.
No update as to whether their cause was found.