valve job, a go? with comp test numbers

[CowKiller]

can i do a valve job( regrind, new seals new rockers pushrods and lifters, ok more than a valve job) with out rebuilding the bottom. i dont have the money to do it all, but i can get the top half cheap. i need to change the timing chain, so that will allreaddy be apart.

[ February 16, 2003, 08:06 AM: Message edited by: cow catcher ]

[Dan G]

Scuze me here, but if you do all that good stuff to the top end, why wouldn't you continue to do it on the botoom end as well? Yeah I know, $$, but I can tell you that if you fix everything up top and now it seats well and all and doesn't leak like a piece of swiss cheese then you're increasing the pressures on your already old and stress rings, piston rods, cylinder walls, etc.

SO, I say bite the bullet and do the whole thing.

By the way, what's cheap? Like how much?

[Jeep Craze]

Hey cow catcher, I woudl say the answer to your question woudl be YES if you have the following. No blow by while running, No loss or low compression in the cylinders, if you have low compression does it get better w/ adding a squirt of oil, or if you have a lack of oil pressure due to something other than a bad timeing cover or pressure spring. If you can say that definetly the lower end is in good shape, I woudl go for it. BUt what is the problem w/ your heads now? Do you have blue smoke on start up? If so that would be bad valveguide seals. so then you woudl benefit from the head job(um Cylinder head that is)if you have low compression and adding oil doesn't increase the compression that too could be a bad valve. If you are gonna go and do the heads and the timiung chain you probally shoudl do the cam and lifters too right away. Just my thoughts Craig

[CowKiller]

i am only 16, aint got a job, and am borrowing $ for gas. so as cheep as i can

i just need to cause a valve on pass side is tapping like crazy.yes alot of prety smoke on start up then it goes away. i have 40 lbs oil pressure all the time, after warming up. but that tap is just plane anoying.
i will check comp numbers tommarow.

[ February 15, 2003, 07:30 PM: Message edited by: cow catcher ]

[Bob Barry]

Tapping valves could be a cam or lifter. Smoke on startup could be blocked drainback holes in the head. Pull the valvecover, and see what condition things are under there. Pull the rockers on the tapping cylinder, and see if they are worn; many times, the rockers wear through or crack and the pushrod punches its way up through the rocker arm.

Yes, you could do the heads, but I just want to suggest it may not be the root of your problem. Do a little diagnostics, and then you'll have a better idea what you need to do.

[millertime]

Dont forget to check you pkugs after you do the compression test. My jeep taps like crazy too and im lookin to do a full rebuild once i buy another car. Its great that the main reason i want to take my engine apart it to fix a tapping sound not to correct a valve problems.

[andy d]

CC, try this at least til warmer weather. turn up the radio so you cant hear the tick. :D keep an eye on the oil. do you have headers? could what you be hearing be an exhaust leak?. if you have limited funds, best to live with it. if it runs well enough to scare you, it will last for some time as is

[CowKiller]

it runs great. i JUST put headers on friday. but it was doing it before. it burns oil prety good. i just did a comp test on drivers side only(the ez side) from front to back, 150 170 160 150.

[Jeep Craze]

Those #'s look alittle high. Sounds like excesive carbon build up in the cylinders/heads. Maybe what your hearing is spark knock from the carbon retaining too much heat? Maybe just a thought. Try to run some marvel mystery oil through the gas and oil see if it gets better. Craig

[CowKiller]

i did. in both the oil. and gas. it never burned oil before i put in the marvel. now it does.

[CowKiller]

ok forget it. does anybody want a used 360, needs rebuil. smokes alot. timing chain shot. no intake/carb. i tired of this motor. lol

[Dan G]

Sure, drive it over in the storm and park it in my driveway. My neighbors already hate me.

Don't worry, I'll drive you back and pay you for the gas it takes to get here. ;)

Just kidding. (sort of)

If you have carbon buildup on the pistons, I've been told that the cure is a bit of water down the carb. NOTICE I said a bit, like 1 or 2 ounces, not cups, and definately not gallons, that much water will make your compression problems go away permanently.

The water generates enough steam (allegedly) to help loosen the carbon and clean up your chambers a bit.

GM also makes a "top end cleaner" which does the same thing see these links http://www.sytyarchives.com/howto/viewarticle.php?article_name=top_end_cleaner.php&dir=engine

http://www.fbody.com/members/stevenmh/Firebird_HTML/engine_cleaner.htm

[CowKiller]

it needs to run for that to work. timing chain wont even let it run. runs for a min, then jumps gears, backfires and dies. now it wont even start