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compression test after head gasket replacement?
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CarotaDaucus
New User
Aug 13, 2012, 7:18 PM
Post #1 of 5
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compression test after head gasket replacement?
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Hello,
Newbie question here about head-gasket replacement: After the head, new gasket, and everything else is reassembled, is it advisable to perform any kind of objective test, such as cylinder compression or leak-down, to ensure that everything is sealed and working properly? If not, please explain?
To briefly summarize the relevant history, my 2001 Hyundai Elantra overheated, broke down and was taken in for repair, where it was deemed to be showing significant signs of compression loss. This was diagnosed as a blown head-gasket. The head was then tested and approved at a machine shop, and the car is currently being reassembled.
Thanks
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Hammer Time
Ultimate Carjunky
/ Moderator
Aug 13, 2012, 7:52 PM
Post #2 of 5
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Re: compression test after head gasket replacement?
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It sounds like you have covered all the bases. I wouldn't see the necessity to test any further unless you encounter a problem after assembly.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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CarotaDaucus
New User
Aug 25, 2012, 12:43 AM
Post #3 of 5
(2207 views)
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Re: compression test after head gasket replacement?
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Hello again,
I have another question about my car's current repairs.
To give an update on the situation, I haven't seen the car since it broke down on August 6, but here is what the mechanic has told me on the phone: the head gasket, which was originally assumed to be the problem, was replaced and the car was reassembled. However, the car is not running properly. Today (around 10 days after reassembly) I was told that the bottom block is broken and that the engine needs to be replaced. I was told that, unfortunately this is what should have been done from the beginning.
I have not yet given permission to replace the engine. It appears that the repair costs (including an estimate for the engine replacement) are now in the general range of the value of the car (that is, the value, if it were running). The parts estimate for the engine is $850, so I assume this means that this is for a used engine. For these reasons, I'm considering giving the car up. I'd appreciate any advice on this.
Also, given that the repairs done up until now have not fixed the vehicle, and that these repairs will be rendered useless by a full engine replacement, should I be responsible for all of the cost for the currently completed work? Besides labor, there have been replacements of the head gasket, the radiator and some associated hoses, the water pump, and 3 belts.
Thanks
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Aug 25, 2012, 2:10 AM
Post #4 of 5
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Re: compression test after head gasket replacement?
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You and the shop seemed to have covered the bases and went ahead and as HT said "after" assembly if not right then what. You just said you overheated to the point of it quitting and that caused significant compression loss. If head gasket was pouring out that badly in any which way it seals compression, oil and coolant from each other in absence of oil contamination, visual of pistons, cylinder walls when apart and if the machine shop was correct about the head being OK then this is a problem.
Not sure why they are so sure now it's lower engine parts after giving you back the car as that could have been ascertained when/if it didn't run properly after the gasket job but might have been fine for then.
What part of the lower end is suspected bad now and how have they concluded that? $850 for a whole used engine would be in the area and always some risk with used with even the best of history and testing.
Rock and hard place situation. If you don't like the current diagnosis if vague and this is close to a lost cause do you want a second opinion from a second shop OR a detail of what is now needed to make this right again now?
T
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Hammer Time
Ultimate Carjunky
/ Moderator
Aug 25, 2012, 3:16 AM
Post #5 of 5
(2198 views)
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Re: compression test after head gasket replacement?
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If the original repairs were due to their misdiagnosis of the extent of the problem, then they should absorb those costs if you are planning on going ahead and replacing the engine. If you elect not to replace the engine, then you would have some obligation to the time spent on your car.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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