Shaved heads and valves wont shut
#42
Launching!
iTrader: (1)
How much do you trust the machine shop?
Where they milled to much?
If seats and valve faces both were ground excessively would make the the valve stem higher, that will lead to pushrod length issues.
Just some stuff to think about. Do you have access to a set of stock heads so you can do some measurements?
Where they milled to much?
If seats and valve faces both were ground excessively would make the the valve stem higher, that will lead to pushrod length issues.
Just some stuff to think about. Do you have access to a set of stock heads so you can do some measurements?
#43
Seats were not replaced. I will have a adj pushrod soon to properly measure, but I would hate to order a new set of pushrods and have a lifter problem.
Last edited by 357i; 09-13-2010 at 09:25 PM.
#44
Betcha 100 gazzillion dollars in mexican money of course you got some kind of dirt in the oil system and the place it will screw with the most is the lifter bleed down. If the lifter won't bleed off they turn into solid lifters and from the description you give trying to adjust the valves I think this is your problem. I've seen it quite a few times and i've also seen it where it complately stops the engine from running by holding the valves open. Does it ever stall coming to a idle?
#48
Try the rislone like i mentioned...i've seen it clean the lifters and they start working again. I've also had it COMPLETELY block the lifters. It depends on what is causing this trouble, dirt in the engine or something coming apart?
#50
I have another idea but it involves pulling some lifters, If you pull a few and disaassemble them carefully you will find any dirt that could be blocking the disks etc. Do you have good oil flow out of the push rods to the rockers?
#51
when I checked it your way(which is right I'm sure) it comes up to 1 1/2 turns which says the pushrods are the right length.
I have good oil flow up the pushrods even at cranking speed
Could I have too much oil pressure or volume causing the lifters to max out?
Does it matter which way I installed the lifters originally? I dont know which direction I put the oiling holes in
I have good oil flow up the pushrods even at cranking speed
Could I have too much oil pressure or volume causing the lifters to max out?
Does it matter which way I installed the lifters originally? I dont know which direction I put the oiling holes in
Last edited by 357i; 09-14-2010 at 04:53 PM.
#53
TECH Senior Member
iTrader: (59)
roll the engine over on a suspect lifter, let it sit for a few minutes holding the valve wide open.
then remove the rocker, the oil should all be pushed out of the lifter, you should be able to move the puck of the lifter up and down on its spring fairly easy with the pushrod.. if you cant then maybe the lifter is locked up.. if you can then it is all in the heads.
.030 off the heads and .030 movement in the valves for example could be the only problem.
then remove the rocker, the oil should all be pushed out of the lifter, you should be able to move the puck of the lifter up and down on its spring fairly easy with the pushrod.. if you cant then maybe the lifter is locked up.. if you can then it is all in the heads.
.030 off the heads and .030 movement in the valves for example could be the only problem.
#54
I suspect something is causing the check ball in the bottom of the lifter to stick closed. If these check ***** are dirty or sticking it will cause the issue you are having. Buy a qt of Rislone and try that before you do anything else, If the ***** are sticking it will clean them up.
Last edited by HotSilverBird; 09-14-2010 at 06:58 PM.
#57
11 Second Club
iTrader: (1)
I thought this engine had only 400 miles on it? How does anyone think 16 lifters will all get f'd up at the same time with such low miles.
The reason I ask if you had any stock heads was so you could measure the valve stem height versus your head and if you could find a spot to measure the deck thickness to see how much was really cut.
The reason I ask if you had any stock heads was so you could measure the valve stem height versus your head and if you could find a spot to measure the deck thickness to see how much was really cut.
#58
I thought this engine had only 400 miles on it? How does anyone think 16 lifters will all get f'd up at the same time with such low miles.
The reason I ask if you had any stock heads was so you could measure the valve stem height versus your head and if you could find a spot to measure the deck thickness to see how much was really cut.
The reason I ask if you had any stock heads was so you could measure the valve stem height versus your head and if you could find a spot to measure the deck thickness to see how much was really cut.
#59
are you sure they don't close at all. what sort of overlap is this camshaft because that can affect compression test greatly because the engine isn't going to create efficient compression until the cam is in an efficient rpm range. waaaaay above cranking rpm. and of course the pressure with skyrocket with the valves comlpetely shut with no overlap as the camshaft is now out of the equasion. I haven't read the whole thread but it is something to remember when using a compression gauge.