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 Posted: Tue Dec 21, 2010 7:01 am |
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Joined: Feb 11, 2010
Posts: 111
Trade Rating: +2
Location: Doncaster
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Jus looked in the haynes and it says (when doing a compresion test) low compresion on the 1st stroke which does not build up pressure during sucsessive strokes indicates leaking valves or blown head gasket .
Then goes on to say . A low reading from 2 adjacent cylinders is almost certainly due to the head gasket having blown between them .
So im going to try get it preasure tested and let you guys know the results.
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Posted: Tue Dec 21, 2010 7:12 am |
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Joined: Sep 05, 2010
Posts: 461
Trade Rating: 0
Location: Somerset
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A compression test doesnt always tell the whole story......there is a varying range of 'symptoms' when a HG fails, all depending at what point the gasket has failed at..............if the HG has failed at a point between the water jacket and an oilway (as sounds the case for your car) you will get 'oily coolant' and 'mayonaise' in the engine but the compression readings will show as 'normal' due to no leakage of compression.
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| 1.4 hdi, 206, Year..2003, 100,000 miles
Mercedes, ML270CDI, 2002, 200,000 miles
BMW K1200RS | |
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Last edited by panason1c on Tue Dec 21, 2010 7:15 am; edited 1 time in total
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Posted: Tue Dec 21, 2010 7:14 am |
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Joined: Feb 07, 2010
Posts: 5574
Trade Rating: +11
Location: UK
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what if a compression test failed on 1 cylinder yet the oil and coolant etc looked fine?
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Posted: Tue Dec 21, 2010 7:17 am |
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Joined: Sep 05, 2010
Posts: 461
Trade Rating: 0
Location: Somerset
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| DJ- wrote: |
| what if a compression test failed on 1 cylinder yet the oil and coolant etc looked fine? |
That would most likely be a valve that has failed (burnt out) or a valve spring broken.
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| 1.4 hdi, 206, Year..2003, 100,000 miles
Mercedes, ML270CDI, 2002, 200,000 miles
BMW K1200RS | |
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Last edited by panason1c on Tue Dec 21, 2010 7:18 am; edited 1 time in total
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Posted: Tue Dec 21, 2010 7:17 am |
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Joined: Feb 07, 2010
Posts: 5574
Trade Rating: +11
Location: UK
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| panason1c wrote: |
| DJ- wrote: |
| what if a compression test failed on 1 cylinder yet the oil and coolant etc looked fine? |
That would most likely be a valve that has failed (burnt out) |
oww 
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Posted: Tue Dec 21, 2010 7:21 am |
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Joined: Feb 08, 2010
Posts: 10151
Trade Rating: +12
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| DJ- wrote: |
| panason1c wrote: |
| DJ- wrote: |
| what if a compression test failed on 1 cylinder yet the oil and coolant etc looked fine? |
That would most likely be a valve that has failed (burnt out) |
oww |
i though you just bought your car? 
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Posted: Tue Dec 21, 2010 7:22 am |
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Joined: Feb 07, 2010
Posts: 5574
Trade Rating: +11
Location: UK
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| Seabook wrote: |
| DJ- wrote: |
| panason1c wrote: |
| DJ- wrote: |
| what if a compression test failed on 1 cylinder yet the oil and coolant etc looked fine? |
That would most likely be a valve that has failed (burnt out) |
oww |
i though you just bought your car? |
old car i was referring too!
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