Welcome Guest [Log In] [Register]
Posted ImageWelcome to the all new Geo Metro Forum. We hope you enjoy your visit.

You're currently viewing our forum as a guest. This means you are limited to certain areas of the board and there are features you can't use and images you can't see. Registration is simple, fast, and completely free. If you're already a member please log in to your account to access all of our features:

Join our community!




Username:   Password:
Add Reply
Rebuild head problem
Topic Started: Feb 6 2013, 02:27 PM (833 Views)
greengeo
Member
[ *  *  * ]
I just got done rebuilding my head on a 1997 geo metro 1.0 and i replaced all the valves and valve seats and did a leak down test with the cam out and there was no leak and then i installed the cam and i noticed that all the valves had gaps now.I tried to rotate the cam in diffident position but the would not close. Is that normal if not how can i fix that.
Offline Profile Quote Post Goto Top
 
turbogts22
Member Avatar
Dean

Did you disassemble the lifters and clean them out? If not then that's most likely the issue.
Offline Profile Quote Post Goto Top
 
greengeo
Member
[ *  *  * ]
i took each one of them apart and clean them
Offline Profile Quote Post Goto Top
 
turbogts22
Member Avatar
Dean

The other possible issue is the oil pump relief valve is stuck shut. The excess oil pressure will cause the lifters to pump up too much and hold the valves open.

Was there any problem with the car before rebuilding the head?
Offline Profile Quote Post Goto Top
 
Scoobs
Member Avatar
:D

Did you fill your lifters up with oil before you put them back together? if you did, thats your problem. They only need a light coating of oil on them.
Offline Profile Quote Post Goto Top
 
greengeo
Member
[ *  *  * ]
The car burnt about 1/4 quart of oil every 100 miles. Should i place the lifters in oil over night? or should i take them back apart and re lub them?
Offline Profile Quote Post Goto Top
 
clarkdw


Scoobs
Feb 6 2013, 03:19 PM
Did you fill your lifters up with oil before you put them back together? if you did, thats your problem. They only need a light coating of oil on them.
:gp Like the man said, don't fill them up, just a light coat of oil on all the parts. When you install them the plunger should be springy. They will fill up with oil by themselves after a short time running. :thumb
Offline Profile Quote Post Goto Top
 
turbogts22
Member Avatar
Dean

Even if they are full of oil they should still bleed down after awhile. If you used a heavy weight oil to assemble them combined with cool weather then they might not want to bleed down.

I generally soak mine in lacquer thinner to dissolve all the crud and varnish, then assemble as is and install.
Offline Profile Quote Post Goto Top
 
greengeo
Member
[ *  *  * ]
yesterday after work i took all the lifters apart and recleaned them and then re installed them in the head and waited overnight. This morning, The valves still have gaps. How long do they take to bleed down? or is there something else i should try?
Offline Profile Quote Post Goto Top
 
geo pet
Member Avatar
" my strange addiction "

New valves too long?
Offline Profile Quote Post Goto Top
 
snowfish
Member Avatar
Basic GearHead

With the lifters clean, and with just a drop of oil, practically dry, there's a cam position that all valves are closed. :news

Posted Image
Posted Image

The lifters are either too full of oil, or they were assembled incorrectly. :gamerz

A very, very remote possibility is that the new valves are too long. :shake
Offline Profile Quote Post Goto Top
 
greengeo
Member
[ *  *  * ]
i will pull one out and check to make sure there the same size
Offline Profile Quote Post Goto Top
 
Scoobs
Member Avatar
:D

I just had annother idea that actually happened to a friend of mine. When you had the head done. Did they do anything to the cam journels. I had seen once where they had decked the top where the cam journels are and had to hone down the cam journels making the cam hold the valves open. Head junked and annother was done.
Offline Profile Quote Post Goto Top
 
greengeo
Member
[ *  *  * ]
nothing was done with the cam journals
Offline Profile Quote Post Goto Top
 
1 user reading this topic (1 Guest and 0 Anonymous)
« Previous Topic · Engine Tech & Diagnostics · Next Topic »
Add Reply