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#1
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sure you can verify this with a test, pull the coil connector and connect
shop air to each cyl one at a time with the radiator cap off, crank the engine and you will see the coolant blow back thru the radiator, this will indicate a blown gasket/cracked head, normally cyl 3 and 4 are the faulty ones if the head is warped, but check all cyl's the coolant passages may be blown into the combustion sytem Glenn Beasley Chrysler Tech "Mandrake" > wrote in message newsEhad.2733$z96.1928@clgrps12... > consider also that this could be caused by a cracked cyl head.. > > "Geoff" > wrote in message > icas.hpqcorp.net... > > > Joe Pfeiffer wrote: > > > Date: 29 Sep 2004 08:25:54 -0600 > > From: Joe Pfeiffer > > > Newsgroups: rec.autos.makers.chrysler > > Subject: Head Gasket Leak? > > > > Geoff > writes: > > > > > Dave McCormick wrote: > > > > > > > > 1990 3.3L Grand Voyager - lots of miles. When it gets hot, lots and > > > > lots of gas bubbles start appearing in the coolant overflow container. > > > > I've seen this before in other vehicles - I gather there can't be any > > > > other cause than a leaky head gasket, right? Is there any need to > > > > confirm this cause with any reliable test? > > > > > > It probably is a head gasket leak. One reliable test you could perform > > > that is also inexpensive is a compression check. It sounds like the > > > leak is between one of the cylinders and a water jacket; a compression > > > check would reveal one cylinder with low compression, or possibly two > > > next to each other with low compression. > > > > > > I believe you can get a compression tester for under $50. > > > > His car has already flunked a pretty reliable test of head gasket > > integrity.... > > > > I once had a car with a blown head gasket that flunked the bubble test > > but had compression within specs on all cylinders. > > Really? Did you find the source of the leak? > > I agree, the overheating and bubbling into the coolant reservoir is > probably enough to condemn a headgasket in this case. I understand there > are also kits you > can get that will detect the presence of exhaust gasses in the coolant; > these can be used > to confirm a head gasket diagnosis when the problem is less obvious. > > But a bubbler that passed a compression check, eh? Wow. I didn't know > that could happen. Did one of the cylinders have lower compression than > the others, but still read nominally within spec? > > --Geoff > |
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#2
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sure you can verify this with a test, pull the coil connector and connect
shop air to each cyl one at a time with the radiator cap off, crank the engine and you will see the coolant blow back thru the radiator, this will indicate a blown gasket/cracked head, normally cyl 3 and 4 are the faulty ones if the head is warped, but check all cyl's the coolant passages may be blown into the combustion sytem Glenn Beasley Chrysler Tech "Mandrake" > wrote in message newsEhad.2733$z96.1928@clgrps12... > consider also that this could be caused by a cracked cyl head.. > > "Geoff" > wrote in message > icas.hpqcorp.net... > > > Joe Pfeiffer wrote: > > > Date: 29 Sep 2004 08:25:54 -0600 > > From: Joe Pfeiffer > > > Newsgroups: rec.autos.makers.chrysler > > Subject: Head Gasket Leak? > > > > Geoff > writes: > > > > > Dave McCormick wrote: > > > > > > > > 1990 3.3L Grand Voyager - lots of miles. When it gets hot, lots and > > > > lots of gas bubbles start appearing in the coolant overflow container. > > > > I've seen this before in other vehicles - I gather there can't be any > > > > other cause than a leaky head gasket, right? Is there any need to > > > > confirm this cause with any reliable test? > > > > > > It probably is a head gasket leak. One reliable test you could perform > > > that is also inexpensive is a compression check. It sounds like the > > > leak is between one of the cylinders and a water jacket; a compression > > > check would reveal one cylinder with low compression, or possibly two > > > next to each other with low compression. > > > > > > I believe you can get a compression tester for under $50. > > > > His car has already flunked a pretty reliable test of head gasket > > integrity.... > > > > I once had a car with a blown head gasket that flunked the bubble test > > but had compression within specs on all cylinders. > > Really? Did you find the source of the leak? > > I agree, the overheating and bubbling into the coolant reservoir is > probably enough to condemn a headgasket in this case. I understand there > are also kits you > can get that will detect the presence of exhaust gasses in the coolant; > these can be used > to confirm a head gasket diagnosis when the problem is less obvious. > > But a bubbler that passed a compression check, eh? Wow. I didn't know > that could happen. Did one of the cylinders have lower compression than > the others, but still read nominally within spec? > > --Geoff > |
#3
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Head Gasket Leak?
consider also that this could be caused by a cracked cyl head..
"Geoff" > wrote in message icas.hpqcorp.net... Joe Pfeiffer wrote: > Date: 29 Sep 2004 08:25:54 -0600 > From: Joe Pfeiffer > > Newsgroups: rec.autos.makers.chrysler > Subject: Head Gasket Leak? > > Geoff > writes: > > > Dave McCormick wrote: > > > > > > 1990 3.3L Grand Voyager - lots of miles. When it gets hot, lots and > > > lots of gas bubbles start appearing in the coolant overflow container. > > > I've seen this before in other vehicles - I gather there can't be any > > > other cause than a leaky head gasket, right? Is there any need to > > > confirm this cause with any reliable test? > > > > It probably is a head gasket leak. One reliable test you could perform > > that is also inexpensive is a compression check. It sounds like the > > leak is between one of the cylinders and a water jacket; a compression > > check would reveal one cylinder with low compression, or possibly two > > next to each other with low compression. > > > > I believe you can get a compression tester for under $50. > > His car has already flunked a pretty reliable test of head gasket > integrity.... > > I once had a car with a blown head gasket that flunked the bubble test > but had compression within specs on all cylinders. Really? Did you find the source of the leak? I agree, the overheating and bubbling into the coolant reservoir is probably enough to condemn a headgasket in this case. I understand there are also kits you can get that will detect the presence of exhaust gasses in the coolant; these can be used to confirm a head gasket diagnosis when the problem is less obvious. But a bubbler that passed a compression check, eh? Wow. I didn't know that could happen. Did one of the cylinders have lower compression than the others, but still read nominally within spec? --Geoff |
#4
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"Mandrake" > writes:
> consider also that this could be caused by a cracked cyl head.. > > Joe Pfeiffer wrote: > > > > I once had a car with a blown head gasket that flunked the bubble test > > but had compression within specs on all cylinders. > > Really? Did you find the source of the leak? It was a cracked cylinder head (note your suggestion above!). Mitsubishi 2.6, with the famed intake-valve-too-close-to-exhaust-valve head crack. > But a bubbler that passed a compression check, eh? Wow. I didn't know > that could happen. Did one of the cylinders have lower compression than > the others, but still read nominally within spec? I don't remember that much detail on it, sorry. -- Joseph J. Pfeiffer, Jr., Ph.D. Phone -- (505) 646-1605 Department of Computer Science FAX -- (505) 646-1002 New Mexico State University http://www.cs.nmsu.edu/~pfeiffer |
#5
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"Mandrake" > writes:
> consider also that this could be caused by a cracked cyl head.. > > Joe Pfeiffer wrote: > > > > I once had a car with a blown head gasket that flunked the bubble test > > but had compression within specs on all cylinders. > > Really? Did you find the source of the leak? It was a cracked cylinder head (note your suggestion above!). Mitsubishi 2.6, with the famed intake-valve-too-close-to-exhaust-valve head crack. > But a bubbler that passed a compression check, eh? Wow. I didn't know > that could happen. Did one of the cylinders have lower compression than > the others, but still read nominally within spec? I don't remember that much detail on it, sorry. -- Joseph J. Pfeiffer, Jr., Ph.D. Phone -- (505) 646-1605 Department of Computer Science FAX -- (505) 646-1002 New Mexico State University http://www.cs.nmsu.edu/~pfeiffer |
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