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bikergonebald 5-7-19 8:16

HELP - overheated
 
Hi guys,
Help needed for 1992 MX-6 auto 2.5V6.

I broke down yesterday and had to get recovered. I was out for a drive and had done about 10 miles when i stopped at a junction and could smell burning rubber, I drove of another mile to my destination. When i stopped there was smoke coming from the engine bay but i couldn't see where, possibly down by the cam belt / water pump area but also from the top of the engine under the manifolds. I came back to the car after 30 mins and it started ok but there was a short puff of sooty black smoke so i started driving home carefully but i noticed that when stationary with it in drive the engine tickover slowed and it felt like it was trying to pull away more than normal when i eased of the brake, as if the clutch were dragging but of course it doesn't have a clutch. I also noticed that the temperature gauge was off the scale hot but i don't normally look at it so rather stupidly assumed it was a faulty gauge because there was no steam. It was driving fine because it was flat or down hill for 8 miles, when i got to a short incline the smoke started again along with a rattle from under the car whenever i applied throttle, then the engine died and i coasted to the side of the road.

i tried once briefly to re-start it but it was really sluggish on the starter motor so gave up and called for recovery.

Once it was cooled down we could see there was no water in the system, top and bottom hose were both empty but it started normally and responded to throttle so we could move it close enough to get it on the truck. It was the same for offloading, it started and ran normally but I only ran it for one minute.

My assumptions so far are.
The water was lost slowly perhaps on recent journeys either by a leaking hose, core plug or head gasket.
The smoke from the engine bay was because the engine was hotter than ever and oily dirt was burning off.
It stopped running because the engine started to seize

My questions are
Why would the autobox / torque converter start to drag? Would it be affected by extreme engine heat?
How likely is it that the engine was damaged given that it started and ran normally when cold?
I will do a compression test, if it should fail on a cylinder and i have to remove one of the heads should i do both?

Can anyone offer any other thoughts or guidance?

My wife and son found it funny but i'm gutted and fearing the worst, an engine rebuild costing as much as the car is worth.

Thanks
Kevin

Goodbar 5-7-19 10:12

Likely the rattle from under your car is the piston rod bearings are ruined, maybe even the main crankshaft bearings. The smoke is from oil getting past the cylinder wall. If you don't mind rattles and noise, you may even be able to drive it for awhile until it fails completely. Other than that you need to replace the engine. Rebuilding could be done but the engine may be warped from the heat.

NickR 5-8-19 8:56

It would almost certainly be cheaper to replace that engine than rebuild it.

The good news is that KLZE replacements are cheap(ish) and more powerful.

For example: https://www.enginesus.com/product/kl...-93-mazda-mx6/

Your 1992 car (I think that means you are in Australia?) would be equivalent to a US 1993 model. It's a direct fit.

Edit: I see from your other posts you are in the UK not Australia. No matter. The Japanese Domestic Market KLZE will be a direct fit in any case.

juanpac_tupac 5-16-19 21:02

If you start your engine and it doesnt knock from the oil pan then your rotating assembly could have been spared. It definitely blew the head gasket(s) being it was so hot. The heads will warp and the combustion will blow holes in the head gasket. You would need the heads re surfaced or replaced. There are oil passages and coolant passages in the block. Oil for the cams and lifters and coolant for well, cooling. You can definitely burn oil due to a failed head gasket if the passages are exposed. Typically it will burn coolant or leak coolant out of the block. Severe overheating can definitely ruin your rings and ring lands causing blow by as well as burning oil. Drain the oil and check for metal bits or dust; remove the oil filter and cut it open. Your coolant will have metalic like stuff in it, thats your head gasket. Lots of times it is cheaper and easier to buy a new engine. Being to rebuild one yourself youre removing it out of the vehicle anyway. If your oil doesnt have metal in it could just be the head gasket. Once one head is pulled youll know if your pistons are gone. Good luck!


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