now what?

headwrench · 03-15-2010, 02:07 PM

just did a complete valve job on my 90 g8 . still smokes like crazy on start-up. replaced valves, guides, guide seals, & all new gaskets of course. what am i missing here. when i removed the head about 2 teaspoons of oil was on top of the piston so i figure oil is getting past the seals, but after valve job it still smokes bad. the smoke kind of goes away after running awhile, so im guessing when it sits for a time oil is getting in the cylinder. question is from where? any help? thanks

DOOmsman · 03-15-2010, 02:22 PM

Is there oil in the air cleaner box?

headwrench · 03-15-2010, 02:43 PM

nope. no oil in the box. as a matter of fact, i didnt get far enough in putting back together to even put the box back in. you know, had to fire it up. is it possible that the muffler has a bunch of oil in it? how would i clean that out, if that is the problem.

sabercat · 03-15-2010, 02:45 PM

rings are gone?

DOOmsman · 03-15-2010, 03:13 PM

is it possible that the muffler has a bunch of oil in it?
I would run it and see. Get the air box on it so it has vacuum to the rocker cover.

As Saber said the rings may be weak and now the strong valves are pulling oil.
Check the exact amount of oil in crankcase.

smallblock450sl · 03-15-2010, 08:04 PM

Had oil on top of the piston? More likley your oil rings "collapsed or just wore out". You could still have good compression. If I just had a nickle for everytime I've seen this.....wait can I have a dollar for everytime? Good luck with your build. If you need any help, please ask.

sabercat · 03-15-2010, 08:13 PM

ya thats along the lines of what i was thinking dave, new valves, guides and seals, and still oil on the piston= rings

DOOmsman · 03-15-2010, 08:22 PM

Quote:

Originally Posted by sabercat

ya thats along the lines of what i was thinking dave, new valves, guides and seals, and still oil on the piston= rings

Not sure on that, oil on piston was before re valve.

smallblock450sl · 03-15-2010, 08:34 PM

This is cool. Tell you what, take a compression reading (strong battery and at wide open throttle and valves set at .004 when cold) should be 150 to 175 lbs. Disassemble the engine and check cylinder bore and ring end gap, then look at the oil rings and expander. I will pay for the new rings and gaskets...if that is not the problem. Sound fair?

headwrench · 03-21-2010, 02:56 PM

wouldnt ask for anyone else to pay for the rings, but thanks for the offer. one last question tho, when i pull the cylinder off, do the lifters stay in the block, and do i have to mess with timing in any way? i have never had one of these things apart except for the head. can i pull the jug off without pulling the head? im not to smart when it comes to this thing. it scares the hell out of me! i guess bottom line is, can i pull off the valve cover off, remove the rocker arms. pull out the push rods. remove the bolts holding the cylinder, and pull it off? sorry for the long post. thanks

03-15-2010, 02:07 PM	#1
headwrench Not Yet Wild Join Date: Oct 2008 Location: centerburg, ohio Posts: 68	now what? just did a complete valve job on my 90 g8 . still smokes like crazy on start-up. replaced valves, guides, guide seals, & all new gaskets of course. what am i missing here. when i removed the head about 2 teaspoons of oil was on top of the piston so i figure oil is getting past the seals, but after valve job it still smokes bad. the smoke kind of goes away after running awhile, so im guessing when it sits for a time oil is getting in the cylinder. question is from where? any help? thanks

03-15-2010, 02:22 PM	#2
DOOmsman Gone Wild Join Date: Jul 2008 Location: Reddick IL Posts: 11,220	Re: now what? Is there oil in the air cleaner box?

03-15-2010, 02:43 PM	#3
headwrench Not Yet Wild Join Date: Oct 2008 Location: centerburg, ohio Posts: 68	Re: now what? nope. no oil in the box. as a matter of fact, i didnt get far enough in putting back together to even put the box back in. you know, had to fire it up. is it possible that the muffler has a bunch of oil in it? how would i clean that out, if that is the problem.

03-15-2010, 02:45 PM	#4
sabercat gone yamaha! Join Date: Sep 2008 Location: ontario, canada Posts: 1,424	Re: now what? rings are gone?

03-15-2010, 03:13 PM	#5
DOOmsman Gone Wild Join Date: Jul 2008 Location: Reddick IL Posts: 11,220	Re: now what? is it possible that the muffler has a bunch of oil in it? I would run it and see. Get the air box on it so it has vacuum to the rocker cover. As Saber said the rings may be weak and now the strong valves are pulling oil. Check the exact amount of oil in crankcase.

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03-15-2010, 08:04 PM	#6
smallblock450sl Sometime's............ Join Date: Oct 2007 Location: Tacoma Washington Posts: 11,875	Re: now what? Had oil on top of the piston? More likley your oil rings "collapsed or just wore out". You could still have good compression. If I just had a nickle for everytime I've seen this.....wait can I have a dollar for everytime? Good luck with your build. If you need any help, please ask.

03-15-2010, 08:13 PM	#7
sabercat gone yamaha! Join Date: Sep 2008 Location: ontario, canada Posts: 1,424	Re: now what? ya thats along the lines of what i was thinking dave, new valves, guides and seals, and still oil on the piston= rings

03-15-2010, 08:34 PM	#9
smallblock450sl Sometime's............ Join Date: Oct 2007 Location: Tacoma Washington Posts: 11,875	Re: now what? This is cool. Tell you what, take a compression reading (strong battery and at wide open throttle and valves set at .004 when cold) should be 150 to 175 lbs. Disassemble the engine and check cylinder bore and ring end gap, then look at the oil rings and expander. I will pay for the new rings and gaskets...if that is not the problem. Sound fair?

03-21-2010, 02:56 PM	#10
headwrench Not Yet Wild Join Date: Oct 2008 Location: centerburg, ohio Posts: 68	Re: now what? wouldnt ask for anyone else to pay for the rings, but thanks for the offer. one last question tho, when i pull the cylinder off, do the lifters stay in the block, and do i have to mess with timing in any way? i have never had one of these things apart except for the head. can i pull the jug off without pulling the head? im not to smart when it comes to this thing. it scares the hell out of me! i guess bottom line is, can i pull off the valve cover off, remove the rocker arms. pull out the push rods. remove the bolts holding the cylinder, and pull it off? sorry for the long post. thanks