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TOPIC: Idea Head Gaskets

Head Gaskets 3 years 4 months ago #1304

  • luis.balstad
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Hello! after doing some tests, I have been told I have blown head gaskets, with engine B4204S2

The test results were:

21% 16% 10% 35%

What do you think?

How do I read and interpret those results?

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Head Gaskets 3 years 4 months ago #1306

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luis.balstad wrote: Hello! after doing some tests, I have been told I have blown head gaskets, with engine B4204S2

The test results were:

21% 16% 10% 35%

What do you think?

How do I read and interpret those results?


Welcome to the Forum.

Your 4-cylinder non-turbo Volvo engine is showing very low compression.

This could indeed be from a failed head gasket.

If all other systems show ok a new head gasket should solve the problem.

If the engine has other problems these should also be resolved during the head gasket repair.

Have you read all the OBD codes?

George Dill

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Head Gaskets 3 years 4 months ago #1307

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Thank you very much.

Could you please help me understand the difference between a engine leakage test, and engine compression test?

Thanks again.

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Head Gaskets 3 years 4 months ago #1308

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luis.balstad wrote: Thank you very much.

Could you please help me understand the difference between a engine leakage test, and engine compression test?

Thanks again.


The compression test checks for individual cylinder pressure with the engine spinning at very low rpm.

The leakage (leak-down) test uses an external air source to pressurize one cylinder with all valves closed. The pressure is initially set at a given amount then observed over time to measure the pressure loss.

Both tests are relatively inexpensive methods to check for engine health without extensive disassembly.

From your initial post it appears your car's engine is releasing compression into areas of the engine that do not normally see pressure. This may be seen as oil in the coolant and/or coolant in the oil. If the compression loss is from valve seating problems then a new head gasket would not solve the low compression situation.

Have the OBD codes been read?

George Dill

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Head Gaskets 3 years 4 months ago #1312

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Thank you very much.

I will check the OBD and let you know.

Can I ask for your assistance in something else, please?

vcoa.org/forum/18-S40--V50-1995---2004/988-how-to-know-if-radiator-is-brand-new-and-original-or-generic-and-or-used#1311

Thanks again.

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Head Gaskets 3 years 4 months ago #1313

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Hello again.

When performing a compression test, which should I take as real, 150psi, the maxium it reached while cranking, or 135psi, what marked right after cranking the engine?

If I have results 150 150 150 145 PSI or 135 135 135 130 PSI (Compression test).

And 21% 16% 10% 35%. leak-down test.

How do I read it?

What does it mean? With both tests?

Thanks for your help

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