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Old 10-25-2013, 01:42 AM   #11
DamianDamian is offline
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I didn't see any cracks on the manifold anywhere. Timing is computer controlled, but has no knock sensor (weird IMO).

The part that I don't understand is that #3 knocks ALL the time if I pull it's plug wire or disconnect it's injector. The only way I can get the knock to change is if I loosen the rockers. This is all during idle of course.
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Old 10-25-2013, 02:40 AM   #12
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Rod bearing on #3 rod. The slightly higher revs/load reveals slop in the tolerance?
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Old 10-25-2013, 07:52 AM   #13
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Quote:
Originally Posted by Vettezuki View Post
Rod bearing on #3 rod. The slightly higher revs/load reveals slop in the tolerance?
That's what I think as well especially after the issue he had with bearings during assembly.
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Old 10-25-2013, 10:04 AM   #14
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That's what I thought but I plastigauged it with the new bearing and it was within spec.
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93 GMC Typhoon: new money pit/PITA. Now GT3788R powered.

Boost, because sometimes atmospheric pressure just isn't enough.

"If it has tit's or tires, you can be pretty sure your going to have problems with them..."
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Old 10-25-2013, 10:08 AM   #15
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If you still have the head off rotate the engine by hand and see if you feel anything catching. Also watch the #3 piston to see if rocks or does anything different than the rest.
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Old 10-25-2013, 10:51 AM   #16
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I did that when I first pulled the head off but I'll do it again. It rotates nice and smooth, which is making me lean towards the valves. I'll pull them out later today when my neighbor gets home from work.
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93 GMC Typhoon: new money pit/PITA. Now GT3788R powered.

Boost, because sometimes atmospheric pressure just isn't enough.

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Old 10-25-2013, 04:29 PM   #17
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There is no movement with the piston as far as side to side goes. I also turned the crank to get #3 to start its downward stroke and pushed on the piston and it didn't move.
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93 GMC Typhoon: new money pit/PITA. Now GT3788R powered.

Boost, because sometimes atmospheric pressure just isn't enough.

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Old 10-25-2013, 04:45 PM   #18
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Went back to the listing where I bought the head from and found this:

Details:
Brand new heavy duty stronger casting than factory
All parts are reconditioned factory pieces
Head is assembled with new valve seals
Head is complete and ready to install

Being that the parts are reconditioned, I wonder if they used something that wasn't good.
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93 GMC Typhoon: new money pit/PITA. Now GT3788R powered.

Boost, because sometimes atmospheric pressure just isn't enough.

"If it has tit's or tires, you can be pretty sure your going to have problems with them..."
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Old 10-25-2013, 06:09 PM   #19
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They check everything so I doubt it. Did you listen with a stethoscope before you took it apart to see if you could pin piont the knock?
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Old 10-25-2013, 06:57 PM   #20
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I tried to pinpoint it but wasn't able to. I just know it was internal and related to #3.
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93 GMC Typhoon: new money pit/PITA. Now GT3788R powered.

Boost, because sometimes atmospheric pressure just isn't enough.

"If it has tit's or tires, you can be pretty sure your going to have problems with them..."
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