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Has anyone heard of dropped valve guides in the cylinder heads of the LQ1? Apparently, half of them in my spare engine had dropped. I'm wondering if this is a common problem, or just something that happened to my spare 97 motor.
Tim
Tim
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1995 Z34 - T04E "60" trim, 42.5 lb/hr injectors, AEM WBO2, FFP UD&DB, 3" exhaust, 2800 stall, shift kit, tranny cooler, Powerslot, Hawk HPS, rear disc conversion, KYB, Eibach, HMS F&R STB, Fittipaldi Force 18" wheels, big stereo, lots more coming eventually...
325 whp 350 lb-ft -
Not rare at all. The replacement guides have rings on them so they can't drop. I have all new guides in my motor.Ben
60DegreeV6.com
WOT-Tech.comComment
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It's been suggested to me that the '91--'95 engines don't suffer from dropped guides. The problem is the '96--'97 engines.
I have no way to verify this. It was posted by jman093 in a thread I started: http://60degreev6.com/forum/showthre...coolant-into-2^ some people may call this guy an asshole at times, but he isn't wrong very often -- RobertComment
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They all do it.Ben
60DegreeV6.com
WOT-Tech.comComment
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Sounds like most manufacturers have discontinued them, but these guys still have them.
Unfortunately, theirs don't have the groove for a ring, but the machine shop is going to machine one into the valve guides.
Tim1995 Z34 - T04E "60" trim, 42.5 lb/hr injectors, AEM WBO2, FFP UD&DB, 3" exhaust, 2800 stall, shift kit, tranny cooler, Powerslot, Hawk HPS, rear disc conversion, KYB, Eibach, HMS F&R STB, Fittipaldi Force 18" wheels, big stereo, lots more coming eventually...
325 whp 350 lb-ftComment
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You won't find any that are already grooved. They can also be purchased rom rockauto. PN VG3112. That's where I bought mine from when I rebuilt my engine. 7 out of 12 guides had dropped on my oft raced 96 LQ1 w/ 200k on it. The new ones weren't really any tighter than the stock ones though. Doing it again now, I would have just tapped the stock ones back in and grooved those.Originally posted by timg View PostSounds like most manufacturers have discontinued them, but these guys still have them.
Unfortunately, theirs don't have the groove for a ring, but the machine shop is going to machine one into the valve guides.
Tim
And the machine shop doesn't have to "machine" the groove in there. It's just a little tool you sit on the end of the guide and give it a couple spins by hand and it cuts a small groove in the guide. They shouldn't charge you much for that. I had my own tool from doing Mitsubishi V6's. Those things were horribe about dropping guides.
But to ramble on here, I do think it's very common on an LQ1. It seems there's a lot of completes about smoking/oil consumption and it's generally assumed it needs valve stem seals (which usually never get done). My guess is they need new valve stem seals because they fell off of the dropped guide. If I was to ever have another LQ1 apart, I would go ahead and snap ring my guides to avoid this headache, even if they were all still in place.Last edited by jman093; 05-18-2012, 01:57 AM.Jesse M.
3x 1990 Turbo Grand Prix
1987 Monte Carlo SS AerocoupeComment
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got a pic of that tool?sigpicHow to make High performance Emissions:
A "true" High flow converter, straight pipe.
Low/No flow EGR valve, block off plate.
Carbon canister and purge valve mod, place in large 30 Gallon can, cover, and place curbside, the city will do the rest.
PCV valve and vent tube, reroute to exhaust to dump where it belongs, on the ground. Or add breathers and let it all free.Comment
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