Blown

1

Hello. My head gasket keeps blowing. This will be the third time i will be chaging it. Any pointers on what im doing wrong.

2

Head is probably warped or has some surface imperfection (the former often due to something getting to hot). Or if it is “blown” too much pressure/boost.

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3

I would agree with Mr G head is probably warped if you have not had it shaved.
Also what car are we talking about and what head gasket’s are you using?

4

Hc engine, i get it plained each time.

5

hmm maybe the alloy head has gone soft or the block need decking?

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6

I have the same problem with my 3sz-ve
Water pushes from the radiator to overflow bottle after a long highway drive, when the car stops at a traffic light or stops in traffic, it overheats
Head gasket has been done 3 times, each time the head gets re-surfaced.
Last time around, I re-surfaced the block as well.
Radiator was also changed
Radiator cap has been changed a few times (always use the 1.1 bar)
I just think that the 3sz is a weak motor when it comes to heat

7

I presume you have changed the thermostat and your water pump is good?

8

Yes Sir, both have been changed

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