4M40 Cylinder head gasket problem

[Kingmarz]

I’ve used permaseal gasket a couple of times on Subaru’s leaky EJ25-4 engines and they seem to be reasonable good quality. Yeah I would try the 4 notch gasket as they should be more forgiving and should bring down the compression ratio slightly which may stop the head from lifting if that happens to be the cause and I guess you’ve gota try something different this time also make sure there’s no dirt in the head bolt holes/thread in the block which can be quite difficult to clean especially when not removing engine and being able to turn it upside down on a stand but definitely use brake cleaner. TBH it sounds like you’re doing everything right.
Get a EGT gauge and an aftermarket temp gauge cos just today I was towing fully loaded enclosed trailer 400km in my Pajero 3.2DID and when going up a long steep hill my aftermarket temp gauge was hitting 100 and going back down to 75ish when cruising but my factory temp gauge never moved from just below half way.

[Martynhpajero]

I used a genuine 4 notch head gasket from amayama.com. about $100 I think. And New genuine head bolts from the same place. Peace of mind...

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[chaddy]

I’ve used permaseal gasket a couple of times on Subaru’s leaky EJ25-4 engines and they seem to be reasonable good quality. Yeah I would try the 4 notch gasket as they should be more forgiving and should bring down the compression ratio slightly which may stop the head from lifting if that happens to be the cause and I guess you’ve gota try something different this time also make sure there’s no dirt in the head bolt holes/thread in the block which can be quite difficult to clean especially when not removing engine and being able to turn it upside down on a stand but definitely use brake cleaner. TBH it sounds like you’re doing everything right.
Get a EGT gauge and an aftermarket temp gauge cos just today I was towing fully loaded enclosed trailer 400km in my Pajero 3.2DID and when going up a long steep hill my aftermarket temp gauge was hitting 100 and going back down to 75ish when cruising but my factory temp gauge never moved from just below half way.

yes I will get some gauges installed and try to figure out what is actually wrong with it. Thanks mate

[chaddy]

I used a genuine 4 notch head gasket from amayama.com. about $100 I think. And New genuine head bolts from the same place. Peace of mind...

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I went to this website, it is really amazing. Thanks for that mate. BTW why did you go for a 4 notch gasket?

[4ePikanini]

I always accompany a headgasket job with a new genuine thermostat + radiator cap and a radiator flush (proper removal and cleaned by a reputable shop)

Have you checked the viscous fan is working?

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[Martynhpajero]

I went to this website, it is really amazing. Thanks for that mate. BTW why did you go for a 4 notch gasket?

4 notch is the thickest and therefore the safest option. I'd rather have a little bit lower compression, than any chance of valves hitting pistons.

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[MACXR8]

Try https://www.smsdiesel.com.au/product...ch?qs=ME200754 for your head gasket and bolts. way better than permaseal. all these gasket etc are either OE or genuine

[chaddy]

I always accompany a headgasket job with a new genuine thermostat + radiator cap and a radiator flush (proper removal and cleaned by a reputable shop)

Have you checked the viscous fan is working?

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The fan is noisy as soon as you start the car and it goes away within few seconds. I think that's how they work even on new cars.

I haven't professionally checked it though.

[chaddy]

4 notch is the thickest and therefore the safest option. I'd rather have a little bit lower compression, than any chance of valves hitting pistons.

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Yes that's what I need too. I'll go for the 4 notch one this time. Cheers mate

[chaddy]

Try https://www.smsdiesel.com.au/product...ch?qs=ME200754 for your head gasket and bolts. way better than permaseal. all these gasket etc are either OE or genuine

I'm just wondering whether to order from here or from Japan from the link posted earlier. Which one is the best?

[Martynhpajero]

Genuine gasket ME200754 was about $50 US from partsouq. Plus postage. Genuine head bolts about $3.50 each. Cheap and genuine.

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[chaddy]

Genuine gasket ME200754 was about $50 US from partsouq. Plus postage. Genuine head bolts about $3.50 each. Cheap and genuine.

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This is also a good one. But unfortunately they have run out of notch 4 gaskets

Thanks for all these info mate

[Martynhpajero]

amayama have them from $67.

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[chaddy]

amayama have them from $67.

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Yeah this site is pretty good. But even though I put the best parts in it, I'm still worried whether its gonna give up again