sounds like your rings are cactus mate rering her or rip im afraid
regards smokey

 

Do a compression test
That will help determine what it could be

I think its time for a few beers for Disco Muzz,and get him back in the shed

 

...I think its time for a few beers for Disco Muzz,and get him back in the shed...

Be great if he paid for the beers!

 

is it safe to assume that the smoke is black?

 

Nup!

Lovely shade of light blue unfortunately.

Compression test coming up.

 

yeah as dad said, the smoke is a bluey grey colour!

 

sorry dunno what i was thinking, should of written blue but wrote black, and its not even friday yet

 

I did a motor change recently because mine was exactly the same, blowing smoke, using lots of oil and fouling number 4 plug all the time. I got another motor from a forum member and it has been all good since. Had the old motor out and new one in in about 6 hours.

 

Yeah well I am considering the same. I have a spare motor for the car already, which is actually the original motor. Once I get from schoolies I'll chuck it up on an engine stand and start to rebuild. If we do a good enough job I will chuck up our progress on the forum

 

if you can put up with a bit of smoke just run the heaviest oil you can buy in it. it will use less but the problem will still be there

 

Mine smoked a bit too espacialy when full trottle. Ive used 10W40 at that stage and switched to 20W50 GT1 from Kendall wich we use in our BMW's. The smoke was gone and it burns almost no oil anymore!

So, try some thicker oil and maybe some treadment for seals.

 

The PCV is fed through the carby post-air filter.

Any chance this could be over oiling the intake?

 

As an update.

Matt went over the sump and rocker cover with a torque wrench and ALL of the bolts were loose (some finger tight).

A new rocker cover gasket was fitted. Hopefully, with the re-tensioned sump pan and this, we should reduce oil usage.

Now for the puffs of blue exhaust smoke!

 

Just watch running heavier oil
If the oil pump is showing signs of age/wear the heavier oil could wreck the oil pump quicker

 

Yeah.

Bit suss.

 

L28's are tough as hell. They can run forever. Just try the thicker oil. Not 80W90 but at least 15W40 or what I did: 20W50.

 

Fair enough!

But first I am going to try venting the PCV valve to atmosphere rather than through the carby.

Suspect old dodgy oil is being vapourised and feeding back through the intake, oiling the plugs.

We shall see!

 

Is the smoke normally after an extended time of overrun? (long decents?) My old girl puts out a hell of a plume of blue smoke after running against engine then accelerating towards next incline, always put it down to worn valve stem seals, mates SD33 does same with 500+k's, once the blue clears, the black starts! Mine been worse since going to Repco 20W/50, but got 20L of it, so the old girl will have to put up with it for a while.

 

Yeah.

So it's not the end of the World?

Matt is so upset he was talking about buying a Toyota!

 

This is great feed back.

Thanks folks.

I guess we could summarise it that;

A puff of blue smoke is not really the end of a L28.

 

Nah! Keep the MK! They are way more fun!

 

Yeah I am. I just love the look and style of the MK, it's unique!

GQ's are so common!

I have put 20W-50 oil in the girl now and only seems to blow or puff smoke if I push it out to about 6 grand in first (ie taking off when theres traffic coming) or if I let the motor wind the car down (ie gearing down ) which I think someone has mentioned.

I will, with dads help try to do rebuild the spare L28 over summer and maybe upgrade it a bit. Money permitting!

 

You might have the same problem I had, and from what I saw in a 44 gallon drum at the mechanics workshop, what many motors have - seized oil control rings.

I had the same problem that you had, and put up with it for 2 years, just feeding it more oil and thicker oil. When I bought the car I was using 20/50 and it was burning about 1 litre of oil for every 400km. then I stepped up to 40/60 for a while and finally Penrite 30/70. The oil consumption improved to about 1300, or 1400 km/litre, but then went backwards after a while. When it came back to 300km/litre I decided to rebuild the motor.

I found all the pistons had no oil control. The oil control rings were seized up solid, flush with the piston skirt. The compression rings looked OK, quite loose in their slots. I think the previous owner had not changed the oil for a long time and the oil was full of sludge. When I gave it its first oil change, a couple of days after I bought it, the oil smelled like a dead horse! Never smelt oil like that before. Horrible! If I had known what the problem was I might have fed it a few bottles of de-sludging additive over a few oil changes. But I don't know whether that stuff is just a gimmick or not.

Anyway, if you do a rebuild, check your wear in the bores. Mine was only 2 thou out of round after 260,000km. Very tough liners in those bores. If you do not need a rebore, because of minimum wear, like mine, I would suggest you do not hone them either. I did a bit of research, some from my Repco Engine Maintenaince book, and some from the Internet, and found some info that says how honing can do a lot of damage to your bores, your new rings and your new bearings. ( I put up a thread on here somewhere ealier this year if you want to read more.)

Nearly everyone told me I had to hone or their would be blue smoke pouring out of the exhaust and the rings would never bed in. Even the mechanic that rebuilt my head.

Anyway I had already honed #1 and #2 before I discovered this info. So I did not hone the last four cylinders. Guess what - not one skerrick of smoke and no oil has been burned in the 10 to 15km since the rebuild. So have a good think about it. I see the glaze on the bore as a perfectly good thing. I see it as a good cushion between the metal of the bore and the rings, just like a film of oil in a sense.

 

Nearly everyone told me I had to hone or their would be blue smoke pouring out of the exhaust and the rings would never bed in. Even the mechanic that rebuilt my head.

i remember that thread, ive bought it up a few times since then and its quite controversial. have you driven it much since the rebuild?

 

Drive it in the ground
Probably good for another 1/2 million Ks
Just dont go bootin it around the fuzz

Be nice to daddy and start the spare rebuild,when its done just a weekend expidition and do the swap

 

I thought that the engine in it was the original, but rebuilt. The spare is the Jap import. Spare should be F54 block and a P90A head. Hmm. I wonder if the guy that rebuilt it didn't give me my original engine back. To be honest I never checked the serial numbers as it was painted over when I got it.

The head got a reco job a few years ago.... got new exhaust vavles and guides as it was using oil and blowing smoke. Was heaps better after. But the guys that did that were the same guys that put the carby on so, well... who knows!

You might be able to make some $ by selling off the current head. Supposed to have welded up and reshaped chambers to increase the compression. Careful giving it too much in 2nd or 3rd, it pings sometimes.

Still got the how to rebuild and modify books here, and the other bits.

Regards,
g@z.

 

Hi g@z!

Sorry for not picking the gear up (yes, I want those books)! Will get around to it soon(ish).

Don't worry about the old girl. I reckon she is a stellar piece of machinery.

 

Jelmer160, MQ MAD and seehuusen!

You need counselling!

 

LOL more than likely hahaha

(will actually sink a big wad of cash into my MK in about 6 months time..)

 

No probs Murray.

neRok, the motor has done 18,000km now, including a trip through the Gawler Ranges to Oodnadatta and another one through the parks north of Renmark to Menindie, down to Geelong and back to Adelaide. Its a thrill not having to keep checking the dipstick and adding a litre of oil at every fuel stop! Who needs extreme tracks to get their highs! Trying to work out which way I go this Xmas hols - WA, NT, the Centre, Queensland or east coast for body surfing. Decisions, decisions.

 

Counselling,
Far out muzz,your hurting my feelings

Im gunna have to grab a beer and take this heart felt attack on the screaming L28

Im that hurt i might go 2 or 3 beers,you really hurt my feelings

Carton or two it really hurt muzz

LOL
LOL
LOL