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700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars |
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I've just joined the (operational) 940 owners club!Views : 7602 Replies : 53Users Viewing This Thread : |
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Jan 29th, 2022, 22:43 | #51 | |
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Jan 29th, 2022, 23:17 | #52 |
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There's a bit of a misfire going on now on accel, and a fair bit of liquid coming out of the exhaust.
A slightly longer but awkward video as I had to film, press the accelerator and not fall over. I barely manage the latter on level floors at the best of times! https://youtu.be/bSUEwfMbOiM
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Jan 30th, 2022, 09:30 | #53 | |
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General figure should be 120-160psi depending on your compression ratio but the important thing is consistency, shouldn't be more than ~10% variation between them. Once complete, refit the plugs, HT leads, fuses etc and check it fires up as it should. Then consider doing a cooling system pressure test too.
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Feb 6th, 2022, 21:15 | #54 |
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Well, I compression test (twice per cylinder to check):
4: 155 / 160 3: 150 / 150 2: 125 / 120 1: 150 / 150 Rechecked cylinder 2 at 120. Sparkplug on cylinder 4 looked a little white but otherwise OK. All the others were fine. I pressurised the coolant and after finding and curing a couple of drips it lost about 2psi over 20 minutes. Then I saw a bit of water under the car and went investigating - I found it hard to get a picture of it, but it was coming out of the exhaust side of the head gasket, flowing down the side of the block. Put everything back together and tried running it; lumpy AF with a nasty knocking noise and won't idle. Greeaaaat. Double checked the spark plug leads all went back OK, and that's alright. Reckon the HG definitely needs replacing at this point. I've had the spare head skimmed at a local machine shop (Jamieson's in Bedminster for reference; can highly recommend them for machining work). I'm planning on rebuilding it off the car, then swap it in one go. But it's undrivable for now - luckily I've been able to borrow a car for the next couple of weeks.
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