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Old 03-01-2011, 09:43 AM
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compression test HELP

ok heres the story on my truck i had a stock 5.7 tbi in my truck and did a cam ,head,intake,and crab swap the heads are

world sportsman II heads 200cc runners 2.02 1.64/64cc

comp cam 4x4 X4270H 270/274 480/498 @111

intake with 4160 750 holley

now after getting it to run right i took it out to test drive it and there's no power .motor rev's up and sounds good but it's worse than the tbi setup i had on it before .so i noticed a ticking sound coming from the valve cover.i think i have a collapsed lifter or didn't set the rockers arm right.so i was going to do a compression test to see if i'm losing compression in any cylinders.
so i question is about what psi should i be in when i do the test??

thank you rob

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Old 03-01-2011, 10:09 AM
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Run the test

Run the compression test and post the results and we can go from there . Be sure to pull all plugs and disconnect the power wire from the distributor and tie the throttle wide open to get accurate results .
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Old 03-01-2011, 10:17 AM
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ok i'll do that

if some of the lifter's are not set right or collapsed. can that make it have no power
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Old 03-01-2011, 11:08 AM
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also when i first put the lifters in and set the rocker i didn't prime the lifter's i just soaked then in oil for a hour.so maybe i wasn't getting the right per load on the lifters
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Old 03-01-2011, 11:49 AM
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Hi
With new lifters. Clean them first. Then if you want soak them in oil, but it's not necessary. Put the lifters in (with assembly lube on the flat) then lube the engine with priming, that will fill all the lifters.
Rich
PS You didn't mention about the distributor, what are you using?
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Old 03-01-2011, 01:00 PM
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Quote:
Originally Posted by 350chevyrob
also when i first put the lifters in and set the rocker i didn't prime the lifter's i just soaked then in oil for a hour.so maybe i wasn't getting the right per load on the lifters
I hope you used a break in lube on the lifters and lobes, as well as an oil supplement for the cam break in, and you also broke the cam/lifters in correctly.
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Old 03-01-2011, 01:22 PM
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ok i just got done pulling the intake and check all the lifter .i pulled each one out and look to see if it collapsed or wore down the cam. all of where good for one was collapsed .so what do i do now??can i just buy one lifter.


and i put the lube that was supplied with the cam.all on everything
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Old 03-01-2011, 01:33 PM
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Quote:
Originally Posted by 350chevyrob
ok i just got done pulling the intake and check all the lifter .i pulled each one out and look to see if it collapsed or wore down the cam. all of where good for one was collapsed .so what do i do now??can i just buy one lifter.


and i put the lube that was supplied with the cam.all on everything
If one of the lifters is worn concave on the lifter face, the only way forwards is to replace the cam and all the lifters. The lifters are wear-matched to the cam during break-in... if you try to change replace the lifters without replacing the cam (or vice versa), you'll be almost guaranteed to wipe all the cam lobes very quickly.

PS. Comp Cams provide red lube with their cams which doesn't have a great reputation. Can't go wrong with moly lube on the lobes and the face of each lifter.
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Old 03-01-2011, 01:38 PM
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Quote:
Originally Posted by v8hed
If one of the lifters is worn concave on the lifter face, the only way forwards is to replace the cam and all the lifters. The lifters are wear-matched to the cam during break-in... if you try to change replace the lifters without replacing the cam (or vice versa), you'll be almost guaranteed to wipe all the cam lobes very quickly.

PS. Comp Cams provide red lube with their cams which doesn't have a great reputation. Can't go wrong with moly lube on the lobes and the face of each lifter.

the one lifter was just collapsed .the lifters face looked like the rest of them.

so is there a way to fix the lifter ?
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Old 03-01-2011, 01:41 PM
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Quote:
Originally Posted by 350chevyrob
the one lifter was just collapsed .the lifters face looked like the rest of them.

so is there a way to fix the lifter ?
Oh, well that's not so bad then... you could strip that lifter down, clean it out and reassemble. Not sure what would cause it to collapse though. I'm sure someone else will be along to advise on that.
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Old 03-01-2011, 02:07 PM
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Hi
Just buy one lifter & put it in. Use some break-in lube, it will be fine.
Rich
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Old 03-01-2011, 02:16 PM
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Quote:
Originally Posted by richard stewart 3rd
Hi
Just buy one lifter & put it in. Use some break-in lube, it will be fine.
Rich

yea i call the mechanist at napa at he said the same thing.

also when i took the lifter apart it only had the top plunger.there was no spring in it .so i must of got a defeted lifter

i just put the cam in two weeks ago and only drove maybe 20 miles to get it home from my buddys house where i worked on it at
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Old 03-01-2011, 02:18 PM
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Quote:
Originally Posted by richard stewart 3rd
Hi
Just buy one lifter & put it in. Use some break-in lube, it will be fine.
Rich
Did you add any of this stuff as Cobalt 327 suggested? If not you should get some & use it.
http://www.eastwood.com/zddp-plus-oi...ve-3-pack.html
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Old 03-01-2011, 02:26 PM
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Quote:
Originally Posted by 350chevyrob
the one lifter was just collapsed .the lifters face looked like the rest of them.

so is there a way to fix the lifter ?
This can usually be fixed.

You'll see a C-clip at the top of the lifter body. Carefully remove it, the pushrod seat and metering disc. Now tap the lifter upside down on a cloth covered piece of wood so as to not harm the lifter and see if the piston will come out.

If not, you will need to see if you can free it up w/compressed air and/or carb spray. If you still cannot get it to budge, as a LAST resort, carefully heat the lifter up from the bottom. I would say to try a hot air gun but I have had lifters that I had to wrap in a rag to catch the piston and heat the damn thing up w/a pencil butane torch. Should you have to resort to this- BE CAREFUL!!! There will be hot oil, hot steel, and it can be ejected at high speed- any or all of it will hurt/burn/maim you or bystanders. Wear gloves. Wear safety glasses. Wear a shirt w/sleeves. Work outside or in a well ventilated shop- not in the kitchen.

Once you have the piston out, remove the clipped-on retainer on the bottom of the piston. Careful not to lose the tiny check ball and tiny spring that are both under the retainer.

Clean everything spotless and check the piston and the lifter bore for any signs of burrs or irregularities that might cause them to bind.

Apply a very light amount of oil (WD40 or 3 in 1 oil works well for this) and see if the piston will easily slide in and out of the bore. Work w/it until it does.

Reassemble the lifter and relube the lifter bottom and the lobe, reinstall the lifter and pushrod, set the lash and that's it.

The photo is of a roller hydraulic lifter. It has the same components as most lifters. The arrow is pointing at the clipped-on retainer that contains the check ball and spring.

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Old 03-01-2011, 03:42 PM
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ok bought a new one and slap it in with some lube lol

my friend is coming by to give me a hand with truning the motor over so i can set the vavles i'll let you know how it turns out
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