Quick question about valve clearances

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TankII

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Does each valve pair have to be exactly the same?
On the front bank, I have one intake and one exhaust that is one feeler gauge tighter than the rest. None are looser than specification. I'm using my own metric feeler gauge set.

I dread the rear - that's the bank that I think I've got problems with.

I didn't do the valve adjustment at 210K miles, and over time I've had one cylinder that seems to stop the cranking - even with a new battery, it will literally stop cranking. I also am burning oil, and it could be related to the cylinder locking problem (drain-down on a valve guide?). I'm running richer than the computer tells me too - it will reek of gas after a week of daily driving, but not after sitting for months (which I think is why I have a slight rod knock). Yes, I replaced the cats, and the new ones behaved the same - OK for a week, then couldn't keep up anymore. And, it has a consistent hesitation from 2K to 32oo that has been getting worse over time, despite me doing everything else for the 60K (along with the new cats and cat-back). It pulls hard to 7600 RPM (well it did until I heard the rod knock), so it's not a breathing issue overall.

The front bank appears to be fine, all within specifications, though as I mentioned two valves are slightly tighter. I really hope I find a badly out-of-spec valve on the rear bank to justify the engine's behavior.

On my old '94 Honda Accord, all my Plymouth Crickets and Ford 2.6L/2.8L/2.0L motors, it was easier to get them exactly the same. I don't think I'll have too much trouble with this (first time doing it though), I'd like to get guidance as to the necessity.

TankII
1991 Electric Red, 254K miles. One KONI out for repair, doing valve adjustment, will drop pan for rod bearings next
 

TankII

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Quick update:

Rear bank exhaust had one tight, the rest are fine.
The intakes - middle cylinder had both tight, only one other was tight. All within specs though.

I am unable to get the thickest feeler gauge for each on any valve, and on some, the next one down won't fit. So overall, it appears my stumbling can be found elsewhere.

Ideas before I pop all of them out to get them exact?
 

TankII

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Flipped intake shims for 3 and 5, took it right up to the .20xx spec range. Cyl 1 is a bigger though, digging though the ShoSource shim kit for the right combo.

Gonna be a long night, I think!
 

TankII

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Most of the front bank came in line with flips. Some needed to go thinner (valve recession?) And a couple needed to go thicker to get in the middle.

Stopping for the night.

Also, cleaned the IAB and TB.
 

Irish Pride

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I just finished a valve job on my 89. It was a pain in the ass. I did a complete head and cam swap but not together so I was starting from scratch. In the end I got all of my exhaust valves to measure .013 and all but 2 of my intake valves to measure .007. The 2 that didn't come in at .007 finished up being .006. I wanted the intakes to be to the tight side but didn't plan on those 2 being that tight. In the end, they are all within spec so no worries. The car runs great now. I've been driving it all week and loving the fresh power.
 

TankII

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I finished the adjustments, right to spec. I would have run out of shims in the kit if I had tried to get them tighter. Car is coming back together, though I uncovered a wring harness issue which I am taking care of.
 

zoomlater

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I just finished a valve job on my 89. It was a pain in the ass. I did a complete head and cam swap but not together so I was starting from scratch. In the end I got all of my exhaust valves to measure .013 and all but 2 of my intake valves to measure .007. The 2 that didn't come in at .007 finished up being .006. I wanted the intakes to be to the tight side but didn't plan on those 2 being that tight. In the end, they are all within spec so no worries. The car runs great now. I've been driving it all week and loving the fresh power.
So was this the modified 12V engine?
 

TankII

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End result:
Smooth start and idle. No change in the 2K to 3.2K RPM hesitation/stumble.
And yes, I replaced the ignition wires too.
 

Irish Pride

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So was this the modified 12V engine?
Yes, she's running on all 24 valves now. Not only were half the valves dormant but the ones that were opening were so loose they were barely opening. I drove it like that for a year and now it feels like a totally different car. The PO was a *****. I have plenty more to tell about this car. I found all kinds of stuff once I tore it down. The things he did and why he did them.
 

zoomlater

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Yes, she's running on all 24 valves now. Not only were half the valves dormant but the ones that were opening were so loose they were barely opening. I drove it like that for a year and now it feels like a totally different car. The PO was a *****. I have plenty more to tell about this car. I found all kinds of stuff once I tore it down. The things he did and why he did them.
Good to hear you got it running the way it should. Is the gas mileage better or worst now that you have it running the way it supposed to?
 

zoomlater

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End result:
Smooth start and idle. No change in the 2K to 3.2K RPM hesitation/stumble.
And yes, I replaced the ignition wires too.
Did you find any codes that would cause the stumble? I had a car that had no codes but stumbled in that range until it was wide open throttle. Ended up being a bad fuel pressure regulator and bad wires.
 

Irish Pride

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Good to hear you got it running the way it should. Is the gas mileage better or worst now that you have it running the way it supposed to?
Don't know yet. I'm still running on its first tank since I finished. The power is there now though. This engine is strong. I'm really happy with it now.
 

TankII

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Did you find any codes that would cause the stumble? I had a car that had no codes but stumbled in that range until it was wide open throttle. Ended up being a bad fuel pressure regulator and bad wires.

I'll have to try the pressure regulator. I've done everything else to it other than change the injectors and the regulator. I'll take it off my spare engine. Thanks!
 

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