Valves? How will I know if it needs a valve? All valves? How would I know if the head isn't warped or cracked. I don't think the head is cracked as I can see where the head gasket went bad. Bubbles and gurgles, smokes white, pukes from the radiator. All the typical head gasket symptoms. By the way the girl I loaned this car to kept driving it after it was too hot from a loose wire causing the fan to not come on. I'm pretty sure new head bolts are also in order. I'm attempting this myself to save money.
2006-07-03 15:22:27 · 9 answers · asked by Rick 7 in Cars & Transportation ➔ Maintenance & Repairs
No coolant in oil, no oil in coolant.
2006-07-03 15:51:30 · update #1
95,000 miles
2006-07-03 15:52:28 · update #2
If you clean the head surface very well you can lay a straight edge on it annd measure any warpage. If it was running well before, a valve job may cause more pressure on the rings, but I doubt with 95,00 miles you would cause any problems.
An alternate way for you to check is to drag a sandpaper (about 180 grit) wrapped board over the head surface and see if warpage is evident. Make about 4 or 5 smooth full strokes as if you were trying to plane a slice off of the head. Read the results, if the surfauce is warped, the paper wont touch in the middle.
A machine shop can re work that head for about 150 bucks or less. Unless you can be sure, best to let them do it. You need to replace the stem seals anyway. You must use new head bolts. They are torque to yield type. Re-use is a no-no.
2006-07-03 16:08:50 · answer #1 · answered by br549 7 · 0⤊ 0⤋
You gave some very detailed info in this question and seem knowledgeable. I am going to give more of an info request than an answer. When you say "the spring is still compressed and the rocker is all the way up" do you mean that the spring is compressed and there is a gap between the rocker and the the top of the valve and/or free play in the rocker? If that is the case, you have a stuck valve. If it wasn't stuck before hand I would suspect that either something fell into the exhaust runner of the head which is holding the valve open, or you accidentally switched the intake/exhaust push rods and the piston tapped the valve bending it in the process. You DO NOT want to crank this engine over with the starter if that valve is stuck open! It will end up bending the valve! What you want to do is remove the rocker arm and push the top of the valve with the butt end of a hammer. If it moves down but doesn't return to the closed position you need to yank the head and check what is going on before more damage to the cylinder head or piston occur. I have worked for gm as a master technician for 15 years. Lifters do not stick with the plunger up!! Lifters bleed oil down and collapse not allowing the valves to open enough upon restarting until they pump up with oil. I have done at least 700 lower intake jobs & 250 head gasket jobs on these engines. Either way, your issue is a stuck open exhaust valve with I feel from your description free play between the rocker and the valve. Which, rules out the poster below mines false theory of extended lifters. I will not steer you in the wrong direction. My info is fact and gm experience based unlike some others that probably did an intake job in there yard or work at pepboys. I'm sorry but I had to clear that up. If you would like to email me and I will guide you through the process. Just to clarify for the person below me, I'm assuming you use the rocker arm tool instead of unscrewing the rocker bolts, and you noticed sometimes the pushrod is hard to get passed the front lip of the rocker? Yeah, thats not extending, it's air in the lifter that escapes through the pushrod when the spring pressure forces the plunger back down. I didn't mean to be rude, just don't want to see a guy ruin his engine from false info.
2016-03-27 02:59:22 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Take the head to a respectable machine shop and have them check the head. No way for you to know if it is warped or damaged at home. Depending on miles on the head you may want to get a valve job done while its off. Most parts places with a machine shop will sell you a rebuilt head for your core. New bolts are cheap to go for it. Good chance the head was damaged from the sound of it so just turn it in and get a rebuilt one. Then you know it will have no problems anywhere.
Carbon in the heads combustion chamber should let you know about carbon on the rings.
2006-07-03 15:30:53 · answer #3 · answered by Sowhat 3 · 0⤊ 0⤋
Take the head to a machine shop and have it checked. They will tell you if it is bad or not and it will be well worth it to know for sure before you sink all that money into it just to find out you have to do it again. there can be cracks that are not visible that open up as the metal gets hot. Or if there is even the slightest warp it will not seal properly and it will have to be shaved to seal. Also you need to look at the block and pistons to see if they are cracked or damaged. Water does not compress like air and gas and can and does cause severe damage inside motors so take your time and inspect everything. If it looks like a crack anywhere have someone else look at it too. If they think it is cracked ask a mechanic to look at it. hope I have been helpful.
2006-07-03 15:37:05 · answer #4 · answered by king_davis13 7 · 0⤊ 0⤋
That's an iron duke....it's a pontiac 2.5. Should be very durable. Pull off the head and send it in. If it's OK, put the engine back together and drive it. The only thing I could imagine is that it may need a timing set as it is close to 100k. If it has serious head problems, I would recommend ordering a remanned long block. You can go to racerwalsh.com (I think) and order a racing 2.5 for almost the same price though. That would be the way to go. Good luck!!
2006-07-03 16:03:34 · answer #5 · answered by jeff s 5 · 0⤊ 0⤋
You may have a warped head or need the block decked. Sometimes when a head gasket goes it will eat a path in the head or block that has to be machined out. It is also likely that the head is warped and will require milling.
2006-07-03 15:52:58 · answer #6 · answered by jimbobb1 4 · 0⤊ 0⤋
send the head to a machinist and pay him to check it for cracks and do a valve job. Remember good valves/compression on a high mileage lower end may equal excessive blowby
2006-07-03 15:45:33 · answer #7 · answered by Anonymous · 0⤊ 0⤋
i would take it to a shop that can check all the things you asked about they have what is needed to check it out that's better then doing it over again
2006-07-03 15:33:48 · answer #8 · answered by doczen3 1 · 0⤊ 0⤋
I might want to check the cylinder rings for carbonization.
2006-07-03 15:28:56 · answer #9 · answered by lifhapnz 3 · 0⤊ 0⤋