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Beehive Bedlam |
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Shaft World Chat Champion
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sickpup Old Timer
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Shaft |
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Shaft World Chat Champion
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Posted: 23:31 - 17 Oct 2017 Post subject: |
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pompousporcupine wrote: | sickpup wrote: |
If the OP really suspects head gasket failure then a sniff test would tell him with more accuracy than a leak down tester and a kit cost £30-£40. |
Reading a bit more about it i probably should be doing a sniff test rather than spending out on a leak down tester |
****Sweeping generalisation - engines do vary****
Unless they've recently been put together badly, or it's a very old and/or poorly maintained motor (insufficient coolant strength) head gaskets rarely fail first between oil and water galleries.
More often than not, the combustion process finds a weakness somewhere around the bore and starts to erode the HG. Since waterways are normally substantially larger and closer to the bore than oil galleries, the first place this erosion is likely to break through is into a waterway, hence why often one of the first indicators of HG failure is unexplained coolant loss, as it leaks back into the cylinder and gets burnt off.
In the absence of any of the symptoms I mentioned previously, a sniff test (measuring the amount of combustion gas in the coolant) is a pretty reliable way of testing for HG failure - the faster the test liquid changes colour, the quicker the gas is escaping into the coolant and the more serious the HG failure is.
I would actually do a sniff test first anyway, because the aforementioned symptoms aren't always reliable indicators. ____________________ Things get better with age; I'm close to being magnificent........
20 RE Interceptor, 83 Z1100A3, 83 GS650 Katana
WooHoo, I'm a Man Point Millionaire! https://www.bikechatforums.com/viewtopic.php?t=234035 |
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Roidrage |
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pompousporcup... |
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pompousporcup... World Chat Champion
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Posted: 10:39 - 18 Oct 2017 Post subject: |
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MCN: that sounds like a right faff! i would have expected better from BMW.. for some unknown reason.
Shaft: the engine sat for the best part of 13 years going from the MOT and mileage history which match. I had an engine with a bent rod so while i rebuild that i put in this older engine and got it running..
Compression test before fitting showed 0 on the gauge for one cylinder but the 3 others were within spec so i suspected some sticky rings. It did go up after repeated turning over with WD-40/oil/penetrating oil mix
Running the engine now, it sounds great. Doesn't misfire, cylinder temps are all the same and it has great power. Its an '87 engine so its 29-30 years old.. it does bloody well for something that's as old as i am. Genuinely impressed with it.
That said, that initial compression test result is always at the front of my mind when dealing with this sort of issue hence initially wanting a leak tester |
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Old Thread Alert!
The last post was made 6 years, 192 days ago. Instead of replying here, would creating a new thread be more useful? |
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