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Old 04-20-2017, 01:08 AM   #1
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2002 svt 75k miles no compression?

Ok. so i just picked up a 2002 svt 2dr. black in color, few mods to it ect ect...
anyways thats not the point of this thread.

The person it was purchased from said it was leaking oil and so he parked it till he could fix it. however know since i have it and got a real chance to look it over and get a battery in it i discovered that it appears to have no compression at all. I'm judging this based off the fact that the starter is spinning it way to quick. I'm also hearing tapping/clanking noise from the head (sounds like its coming from the head).
my guess here is that the timing skipped and bent the valves and now they aren't sealing on the compression stroke. I can test compression but lets face the facts here. either the crank broke and all the starter is spinning is the camshafts and pulleys or the valves are bent. i doubt a broke crank.

So am I going in the right direction here?
If so and after compression testing the motor and finding my guess to be correct what parts am I going to be needing? just valves? valves and maybe head work to fix damage valve seats? possible pistons/rods? bearings? ect ect
If its not a compression issue what else could it be?
Should i use it for parts for my 2000 zx3 or rebuild the motor?

I don't know if it actually had an oil leak but I do know I cant find out unless its running.


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Old 04-20-2017, 01:40 AM   #2
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Sounds like you found the answer already, further spinning to tap & clank just adds to the repair bill.

When the timing belt doesn't get replaced this is what happens to SVT's, skip timing or more commonly strip teeth on the belt to lose timing completely, cams not turning.

Then bent valves & no compression.

Head removal & repair in the future to get that one going again.

Look in SVT Performance section as well for more info..
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Old 04-20-2017, 03:33 AM   #3
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yeah i just figured id post it up to get others opinion on it. only paid $700 plus $20 in gas to get it moved. bumpers, skirts, door molding, fogs, rear disc brakes, header, front leather seats, door cards, leather on the shifter and e brake, steering wheel, and metal shifter base is going into/onto my 2000 zx3 and afterwards im parting the rest out. unless someone knows of a decent but inexpensive rebuild kit. i could do the work but don't really have the time to rebuild the motor.
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Old 04-20-2017, 09:02 AM   #4
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I've seen heads that are usable/complete go for reasonable prices recently here, prob. one avail. now if you take a look.

Still needs that pulled (once you check the belt to confirm the assumptions) before you know the rest of the story.
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Old 04-20-2017, 11:09 AM   #5
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yeah, right now the car is at my dads. all i have is basic tools. he however has dam near 2 of everything. iIve gotta wait for him to get back up here to Alaska though. all his tools are locked up.

ive gotta give my wifes mazda a good bath today but after that i might rent a compression gauge to test compression to be sure thats the issue.
looking at parts if i have to pull the head and rebuild it im doing all the valves since id be in there. be looking at $500-800. assuming that the bottom end doesnt need work.

right now i only have $700 into it so its not like rebuilding the motor would exceed the value of the car. i mean after its up and running it would cost me a total of 1500 roughly and the car could sell for as much as $3500-4000. not that i would sell it but the value of the car would still be more then the work i would have to put into it.
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Old 04-20-2017, 11:19 AM   #6
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Don't forget this earlier comment:

Quote:
further spinning to tap & clank just adds to the repair bill.
Cranking it more for a compression test could make the job not worth doing from additional damage. Try turning the crank a bit by hand to see if the cams move for a start, that's a quick check of the timing belt without disassembly of anything.
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Old 04-20-2017, 12:51 PM   #7
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IMO, you should just go ahead and remove the head. It won't hurt much, just a few curses and a dinged knuckle or two. That way you can see the piston tops and know how bad a rebuild would be. Any SVTF is worth that much effort to see if it can be returned to the road... you still have all the parts to use/sell if it turns out it needs a new motor (because piston sets are unobtainable... thanks Ford).
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Old 04-20-2017, 01:30 PM   #8
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yeah, after I get my wifes mazda cleaned up nicely (she is currently using it so waiting) I'm gonna test the compression.
once i see what I'm sure i will (lack of compression) I'll start pulling stuff apart to take a look inside. to fully pull it apart i need to wait for my dad to get back up here next month as I don't have all the tools needed myself and his are locked up.
I've tracked down parts for the head rebuild if that's all it needs. central Florida Motorsports and jc Whitney is the only 2 places I've found valves at. that assuming the head isn't to beat up that i don't have to go to over sized valves. haven't seen any over sized valves if i need them.

If I decide to rebuild the head and thats all thats needed (hopeful talk) should i do the main seals, oil pump, and crank/camshaft seals while im in there?
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Old 04-20-2017, 06:13 PM   #9
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Couldn't you just use a scope camera to see and damage through the spark plug holes?
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Old 04-20-2017, 06:33 PM   #10
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dont have one. guess i could rent one.
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