Guest butlersZ Posted September 22, 2003 Share Posted September 22, 2003 I just replaced the head gasket and timing chain and now my Z is smoking like it's burning oil. It wasn't doing it before the change but all of the sudden its like the rings are blown or a valve seal is gone. Any suggestions??? if it is the seals can I change them without removing the head??? Quote Link to comment Share on other sites More sharing options...
Guest Drewz Posted September 22, 2003 Share Posted September 22, 2003 How many miles have you put on it since the change?? Are you ABSOLUTELY sure you left no carbon or foreign pieces in the cyls before you assembled it? Was the head redone or just scraped off and bolted down?? Quote Link to comment Share on other sites More sharing options...
Guest butlersZ Posted September 22, 2003 Share Posted September 22, 2003 Well, I put about 2 miles on it so far going up and down the road, as for the foreign object deal, there was some carbon on my #6 but I didn't get it all off also , I pulled my #4 plug and it was wet like with oil maybe, so I'm thinking valve seals or rings maybe? what could be the problem if the plug tip was wet? And the head itself was just scraped off and put on, I didn't really have the time to go through everything and do it the way I really wanted to. Can the seals be redone without having to remove the head and buying a new head gasket again? Quote Link to comment Share on other sites More sharing options...
David K Posted September 22, 2003 Share Posted September 22, 2003 When you pull a head off, the coolant in the block gets into the cylinders. Did you drain the block on the side before pulling the head off? t may take a while for the smoke to stop. I did a head gasket and it took a few days for it to stop smoking completely. Quote Link to comment Share on other sites More sharing options...
Guest Drewz Posted September 22, 2003 Share Posted September 22, 2003 Yes the vavle seals can be done with the head on. It can be a little tricky but yes. Also, I would suggest putting it to a compression test after putting 20 miles on it. As dave said above you want to make sure the anti. is all burned off before making any assumptions. The fowled plug not firing could be causing the oil consumption as that cyl. is not firing. Also the possibility that a piece of carbon has stuck a valve partially open which kills the compression in one or more cyls. is possible too. A compression test will tell you if everything is alright and that changing the valve seals will not be a wasted effort. IMO's. Anyone else got ideas??? Quote Link to comment Share on other sites More sharing options...
Guest butlersZ Posted September 22, 2003 Share Posted September 22, 2003 thanks guys, I'll get a compression tester wednesday and test the compression, By then since i'll only be driving it to work it should have about 30 miles or so on it. If the compression is bad on a cylinder then it would be the rings for sure right? assuming the valves are not stuck open. I'm frustrated to the point where I'll just rebuild the WHOLE motor over this coming weekend. I've got the top end gasket set minus the head gasket all I'll need is the bottom end (rings,rods,and bearings and gaskets). UGH! Oh, and another thing I put on was an old 268 cam that was in really good shape. Would that have any affect on the smoking? Quote Link to comment Share on other sites More sharing options...
Guest butlersZ Posted September 22, 2003 Share Posted September 22, 2003 Hey Drew, How can the seals be done with the head on? Would I have to put each cylinder at TDC so the valves don't drop? Quote Link to comment Share on other sites More sharing options...
Guest Drewz Posted September 22, 2003 Share Posted September 22, 2003 There are 2 ways I have done this before. 1 is to bring to TDC and put some rope in through the spark plug hole to hold the valve from falling in. I usually did this with the cylinder 1/4 turn from TDC installed the rope, and than carefully brought it back to TDC to make it a bit tighter but DO NOT EVER FORCE IT IF IT FEELS TIGHT AT ALL!!! way #2 is to get an adapter that threads into the sparkplug hole with a amnual hand valve attatched to it and use compressed air to "charge" the cylinder with some pressure like in a cylinder bleed down test closing the manual valve to hold the pressure and changing the seal. If the rings are weak or the valves are damaged in any way the second method is useless. Over stuffing the cord in method #1 and forcing it to TDC when there is the feeling of stress on the wrench as it is turned to TDC is a NONO.... If you attempt this time and care should be taken but do the Comp. test first to find out where you stand. Quote Link to comment Share on other sites More sharing options...
Guest Drewz Posted September 22, 2003 Share Posted September 22, 2003 You can also try to "steam" the cylinders to try to remove the antifreze that is probably coating the cylinders and such. To do this all you need to do is unplug a main vacum line and place the end of it, while revving thte engine, into a glass of water to "steam" the pistons and other internals clean of and loose carbon , antifreeze, etc. that may be present. I use about a cup full but if it improves I have used more. There is no harm to doing this as gasoline is made up of a certain %age of water itself. ....just a thought Quote Link to comment Share on other sites More sharing options...
Guest butlersZ Posted September 23, 2003 Share Posted September 23, 2003 Hey Drew, just ordered a re-ring kit today and probably rebuild it over the weekend, you have any suggestions on breaking in the motor? Quote Link to comment Share on other sites More sharing options...
Guest Drewz Posted September 23, 2003 Share Posted September 23, 2003 That is a hotly contested question. I break it in for a couple hundred miles before WOT application. Some say if its gonna break it will reguardless of how long a breakin period but a give it a couple weeks driving and tinkering until I drive it real hard. i don't baby it i just don't go over 75% throttle to be safe personally. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.