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2.5t timing belt broken need help with leakdown test

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68lemans462
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Re: 2.5t timing belt broken need help with leakdown test

Post by 68lemans462 »

68lemans462 wrote: Tue Apr 16, 2019 8:15 pm
tardcart wrote: Tue Apr 16, 2019 8:08 pm you can never get lucky if the belt broke, not just skipped three teeth. Even at idle. skip all the testing and just make a decision on if you want to do the job of removing the head and replacing at least 8 valves. you would have to do it as not worth paying for it along with risk they'll do it wrong. You can do it wrong too, but thats a learning experience instead of a rip off.
OK fair enough, I know all about paying for an "education" ... What is a ballpark parts cost to diy the job including head work assuming it needs 8 valves as you say.

I plan to at least yank the cam cover and do a leakdown and comp test as wisely suggested by Rick hale .. Proof is in the puddn' and unfortunately so may be reality!
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Re: 2.5t timing belt broken need help with leakdown test

Post by RickHaleParker »

.
Special tool kit.

Head removal process in attached file.

Because you got the crankshaft and cams out of wack. You may need to modify the process. The file should give you the essentials.

It is possible to get the cam cover off without the special tools and without warping the cam cover.

Study the file then ask questions.
Attachments
B5254T_Cylinderhead_Removal.pdf
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68lemans462
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Re: 2.5t timing belt broken need help with leakdown test

Post by 68lemans462 »

I'm going to remove the cam cover ASAP so I can assess the damage. Any suggestions would be appreciated as I've never done one of these before. I searched this site and google'd and didnt find any good instructions or a write-up on that part of the job. THANKS
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Re: 2.5t timing belt broken need help with leakdown test

Post by abscate »

tardcart wrote: Tue Apr 16, 2019 8:08 pm you can never get lucky if the belt broke, not just skipped three teeth. Even at idle. skip all the testing and just make a decision on if you want to do the job of removing the head and replacing at least 8 valves. you would have to do it as not worth paying for it along with risk they'll do it wrong. You can do it wrong too, but thats a learning experience instead of a rip off.
You can do it wrong too, but thats a learning experience instead of a rip off.
+1000

I think you won the Internet for the week with that one, tad.
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68lemans462
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Re: 2.5t timing belt broken need help with leakdown test

Post by 68lemans462 »

If anyone wants to buy this junk let me know... DONE WITH VOLVOS!
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Re: 2.5t timing belt broken need help with leakdown test

Post by XC70Rider »

68lemans462 wrote: Tue Apr 16, 2019 5:35 pm I'm guessing a potential water pump failure which took the belt with it. The pump belt and tensioner were replaced 50k miles ago.
Have you determined yet if it was the water pump that broke? If it's the water pump please tell us what brand only lasted 50k miles.
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Re: 2.5t timing belt broken need help with leakdown test

Post by atikovi »

RickHaleParker wrote: Tue Apr 16, 2019 7:40 pm Take the cam cover off, closes all 20 valves and eliminates the interference so you do the leakdown and compression test.
How do you do a compression test if the intake valve won't open to let air in?
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Re: 2.5t timing belt broken need help with leakdown test

Post by SuperHerman »

I would suggest you start a new thread, list your year, model and engine and then explain exactly what your problem is so that you will get some help.

For leak down tests the valves on the tested cylinder are closed. Air supply is through the spark plug hole. You would not be able to do a compression test.

Start a new thread with above info and more guidance can be provided.
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Re: 2.5t timing belt broken need help with leakdown test

Post by atikovi »

I wasn't asking for a specific car but want to know how the poster can do a compression test on an engine without working valves.
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Re: 2.5t timing belt broken need help with leakdown test

Post by SuperHerman »

Not sure where you are going with this, but I think you know that a compression test with valves that will not close fully will show little or now compression on any cylinder with bent valve(s). Hence you are asking the question.

The suggestions to the OP was to check for bent valves via a compression test. A leak down test would provide added information, but is really just wasting time if there is no or little compression in any cylinder as bent valves are most likely the cause.

Pulling the upper cam cover would close all the valves as the pressure holding them down is relieved. But a compression test would not work and could not be performed in this state. Only a leak down test as the cams are not moving.

I assume you already know this.
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