Re: No power and popping noises after generator installation '36 STD 8
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Not too shy to talk
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I found these numbers in a Motor's manual. Can anyone verify that the .001-.002 is the correct cold gap? Thank you in advance.
Posted on: 7/20 18:09
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Re: No power and popping noises after generator installation '36 STD 8
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Home away from home
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Quote:
Yeah he tells you how to do it either way in the video.
Posted on: 7/20 19:02
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1955 400 | Registry | Project Blog
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Re: No power and popping noises after generator installation '36 STD 8
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Forum Ambassador
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Secondary sources like Chiltons or Motors may have given suggested cold clearances but I'm pretty confident Packard did not. Yes, doing the adjustment on a hot, running motor isn't a pleasant task, but why not just do it correctly once and be done with it?
The .001" and .002" you've noted are not tappet to valve stem clearances. Hot clearances are 0.004" and 0.006" and cold clearances would be greater, not less.
Posted on: 7/20 19:08
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Re: No power and popping noises after generator installation '36 STD 8
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Not too shy to talk
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Hi all,
Just wanted to pick your collective brains. I did a compression test and here are the results. 120, 30, 0, 120, 90, 100, 120, 50 I just adjusted the valves and I'm not sure what this could be. Head gasket? But I don't see any oil in the antifreeze I just drained. I probably put 500 miles on it since I redid the valves and seats. I also didn't see any oil in the antifreeze I just drained so I'm baffled. I just took it for a spin the other day and it started popping through the carb and it felt different like it had no power so I thought maybe I didn't tighten the generator enough and since it's driven by the timing chain... Maybe it skipped a tooth so I took the whole front end off, radiator front engine mount and timing chain cover only to find that the timing marks are still aligned. Then I thought maybe the valves needed a little adjustment. I adjusted them all to 0.008" and then did the compression test and here we are. I'm not sure what it could be to be perfectly honest. It didn't run hot, it didn't smoke, no oil in the antifreeze ... Just popped through the carb and low power... Maybe I should just throw it away... Ugh... Sorry I'm ranting... Any thoughts would be appreciated... Thanks
Posted on: Yesterday 18:48
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Re: No power and popping noises after generator installation '36 STD 8
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Home away from home
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Sure looks like a blown head gasket between 2 and 3. That would definitely cause low power. Plus the low compression on #8 isn't helping at all. #8 could be any number of things. But I would suggest pulling the head and taking a look at the block. Make sure there are no cracks around the cylinders, check the head gasket and replace it, make sure head is torqued exactly as specified. Torque it again after heat cycling the engine.
Posted on: Yesterday 18:57
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Kevin
1954 Clipper Super Panama "Van Halen" | Registry | Project Blog 1938 Super 8 1605 | Registry | Project Blog 1953 Clipper Deluxe Club Sedan "Rusty McRustface" | Registry | Project Blog 1956 Packard The Four Hundred "Tanner" | Registry | Project Blog |
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Re: No power and popping noises after generator installation '36 STD 8
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Home away from home
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Too little valve to tappet clearance will cause low compression in affected cylinders. Cold tappet clearance should be about .003 to .004 more than hot tappet clearance. It is essential to have the tappet on the low point of the camshaft when adjusting each individual valve. Worn parts can make checking tappet clearance with a feeler gauge difficult, since the flat gauge cannot allow for irregular surfaces on the tappet and valve stem contact points. In such cases, it may be necessary to add several thousandths to the clearance spec, then go back and slightly tighten the clearance on any individual valve that is noisy.
Posted on: Yesterday 19:03
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Re: No power and popping noises after generator installation '36 STD 8
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Home away from home
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An intake valve that has too little clearance could cause popping in the carburetor. Are you absolutely certain that the plug wires are in the proper order?
Posted on: Yesterday 19:05
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Re: No power and popping noises after generator installation '36 STD 8
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Home away from home
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Let me tell you what happened with my 37 115C when I first got it. I'll skip to the good part:
I needed to adjust the valves. I adjusted them to spec and it ran far worse; one valve was still sticking so the head needed to come off. The engine had been rebuilt at some point and I discovered the problem. The tappet screws are supposed to have a slight crown to them; mine were ground flat. Not only that, but several of the valves had worn a depression in the screw. When I put in the feeler gauge, the valves were raised far higher than they should've been to contact the depression in the screw. I pulled the tappets out, crowned all the screws on a cheap HF grinder with the tappet screws rotating in a cordless drill. Heat treated them, put them back in, adjusted properly. Perfect. Do you have a similar condition?
Posted on: Yesterday 22:21
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Re: No power and popping noises after generator installation '36 STD 8
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Forum Ambassador
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Without knowing the reason for the low compression numbers, it's just blind guesswork how to proceed. I suggest doing leakdown testing on cylinders 2, 3, and 8.
Posted on: Today 11:46
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