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Hydraulic valve lifters mixed up[700/1990] posted by Ross Gunn on
Tuesday, 15 September 1998, at 12:19 a.m.
My son (with his '90 745 GLE) is still working on straightening out the
valve damage I referred to recently. While removing the head, he thought
he would save a little work and removed the camshaft carrier without
removing the cams and lifters first. Of course, the lifters all fell
out and now he doesn't know which goes where.
OK so he hasn't got everything right along the way, but he is game to
try (can't afford the alternative) and sure is learning a lot.
The question is, what next? Are the lifters selectively fitted? What
is the worst thing that will happen if they are reinstalled randomly?
If they are selectively fitted, what are the tolerances (so he can have
the lifters and bores measured to get the right pegs back into the right
holes?
I suspect the answer from the Volvo dealer would simply be to install 16
new lifters. I hate to even think of the price for that.
By the way, the verdict on tha damage is 2 bent intake valves, 4 bent
exhaust valves and 2 cracked valve guides. Repair cost for the head -
$180 plus parts (disassembly, dye check, machine valve seats,
reassembly). That is a little better than the quote from Volvo for a
rebuilt head at about $4000 with the old head in exchange.
Any help on this question will be sincerely appreciated.
Answers may be sent with a copy to Don at drgunn@thunder.lakeheadu.ca
--
Ross Gunn
Re: Hydraulic valve lifters mixed up[700/1990] posted by abe crombie on
Tuesday, 15 September 1998, at 2:21 a.m.
In any mechanical thing that has been used and then dismantled it is best to put things where they were due to the possibility that there is a wear pattern, that when violated , may cause accelerated wear of that item.
Okay, what does this mean? Put the lifters back in wherever and go on about your life. The bores for lifters are all the same and the wear on the cam lobes and contact faces of lifters is always negligible in any Volvo engine I've ever been into.
This will have no effect on the lifters doing what they are supposed to do.
This obviously would not apply to the engines that use solid lifters with shims for lash adjustment as the shims would be all hosed up and the valve adjustment would have to be performed from scratch.
Re: Hydraulic valve lifters mixed up[700/1990] posted by Ted on
Tuesday, 15 September 1998, at 4:04 p.m.
Ross,
It's not a problem with the bore diameter of the lifter holes, they are all the same, it has to do with the cams. Each lobe of the cam wears the lifter a certain way. To avoid premature cam wear each lifter is put back with the corresponding lobe. The worse thing that will happen is the cams lobes wearing prematurly. Chances are, that as long as the lifters didn't bounce off the ground bending or scoring the surface, it will work just fine. Even more important is the cleaning of the machined surface between the head and cam box. Use a chemical stripper, USE NO METAL in cleaning the surfaces. Also use the correct sealer not just any blue goo. Also note, we have had serveral heads done by a very reputable machine shop and the engines sucked big time oil thru the guides. Volvo's response was "put a
reman head on" with no explaination to the reason why. The heads in question were ones that had to have guides replaced. just keep an eye on the oil level. If your car has the hydrolic tensioner don't try to collapse it all at once, it will blow out. It needs to be collapsed over a period of about 20
minutes slowly.
Ted
Stillman Volvo