Mitzi GTO TT Head Problem

[Lambo]

Hi Guys, i realize its not a 1uz but i need your expert opinions really bad, my Gto TT needed a new waterpump so i replaced it no problem been there before not a major, refitted timing belt correctly, turned over several revs by hand no problem, turned over by starter with plugs out all ok, went away for a few days reassembled all the extras like intake manifold plugs etc,turned over on the starter and it stopped after a few turns and was jammed solid, crank would only turn over about 60 deg, looked in plug holes all seemed fine, then i thought maybe it got some water down the intercooler while i was away and had hydrolocked, thinking bent rods etc not a good day, dropped the pan rods are fine, so pulled the front head, still locked solid until i loosened off the rear head and then it turned over fine, removed the rear head and expected to find a dropped bolt or something but nothing in the bores, except lots of loose carbon around the lip of the bore and lip of all the pistons, in both heads, and about 3 mil thick behind the squich area beside the exhaust valves, friend recons it was because of excessive towing weight recently lasting a few weeks moving house etc, that caused all the carbon, i did find a leaking turbo intake seal sending oil through the motor, but i use Mobil 1 so i ruled that out, its not supposed to leave a residue, but really need help bad as its my daily driver. Also can i reuse the metal head gasket that it has, it's 3 layers of shim like metal with no paper in it all, any help much appreciated.
Graeme

 

[samsdad]

1. No you cannot re-use the head gaskets no matter what. If memory serves correct the gasket set costs more than another engine from NZ car parts

2. Mitsubishi engines of that era from 1990 do burn oil regardless of what oil you run and as a result carbon up the combustion chambers. But from the look of the pics it is an oil burner on the rear cylinder bank and despite the waterpump problem has some serious issues with a rotten cooling system.

I'd suggest that your cheapest and quickest way out of the problem is a replacement engine

 

[cribbj]

Graeme, if this is your basic transportation and you need to have it up & running or you have no wheels at all, then if I were you, I'd clean up as much carbon as you can, try to figure out where the oil is coming from (valve stem seals?) and sort it out as cheaply as possible.

Then get the thing reassembled with a Chinese gasket set and start shopping for another engine or car ASAP.

 

[gloverman]

Theres more than a few weeks carbon there. Gaskets should not be used and another head set is around $540NZ. Mitsi's tend to burn oil and a secondhand motor would most likely be no better. I would tidy up the heads (make sure some valve stem seals go in) and put it back together. If the turbos have issues sort them. When we have vehicles which tend to burn a bit of oil when have a carbon cleaner which we feed through the intakes when we service them. Helps reduce this kind of issue. Cheers

 

[XR8tt]

I think it's called Seafoam ?? Subaru sell a product which you put down inlet and cleans chambers also..
I would check PCV and maybe fit oil catch can / seperater ...
I have used MLS gaskets with spray on copper coating ..
Has worked .. BUT if you asked I would say replace head gaskets...
Replace head bolts as per specs too...
The heads need need to be machined apso smooth !!!
Yea check guides, seals and crankcase ventilation..

Post from Cafe Tauranga N.Z ..

 

[Lambo]

Thanks guys for all the suggestions, i did strip this motor about 5 years ago to find out why it always used water, and found cracks in the heads between the cylinders to the water jacket that some clever person in Japan had welded up and then ground off the welds, not the brightest.
The old heads were unusable so i fitted heads from a Diamonte they measured up the same, i swapped my turbo valves into it, fitted new valve seals, gave it a valve grind, ,and a general clean out there was carbon just the same as any other motor i have ever stripped but not as much as i have now. The diamonte i pulled the heads from had done 80k and the heads were like new no carbon at all bright aluminium only tinted pink from the petrol, i suspect my motor may have a bit of blow by ,but it never blows any smoke and uses about a litre per 1000-1500 k which could be the turbo problem,so not too bad for a 20yo motor thats not been reconditioned. i do have a replacement rear turbo i can fit, the front shows no signs of an oil problem.
The strange thing was that after the rebuild last time the engine started using water again about a year later, and it never ran out on the ground, but recently, i went to top it up and as fast as i poured it in it just ran out, tracked the leak to the wings on the water pump where they joined the block, maybe it was loosened bolts so this time it will get locktighted up. Another friend suggested maybe it was running very rich, and that it could be the o2 sensor but the car does 30 mpg on a run so i ruled out that is running rich. So really puzzled why i have so much carbon.Maybe because i drive it like grandma lol, my son says i need to drive it harder, but then i could't afford the speeding fines. Maybe cheaper to try the seafoam, as i don't need to have to strip this motor again, its a major to get apart. Also whats the best way to check the valves, pull them, and spin in a lathe, they look fine in the head and with the cams installed they moved smoothley no binding etc and no signs of them hitting the pistons at all.

Best regards
Graeme

 

[ruishy1]

water injection is great for cleaning out engines ! we fitted it to a mercedes c230 kompressor, the car was stripped for spares eventually and the engine looked as if it had been steam cleaned



lol

 

[XR8tt]

water injection is great for cleaning out engines ! we fitted it to a mercedes c230 kompressor, the car was stripped for spares eventually and the engine looked as if it had been steam cleaned



lol

Yep with a little metho in water..
Just google water / meth kits ...
Can be made up with another
windscreen washer bottle..
Check seals in turbo's..

At present in Internet cafe Taupo N.Z..