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Update: Sputtering diagnosis w/vacuum gauge

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rasputen

01-13-2005 16:09:27




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RE: "Sputtering" vacuum gauge diagnosis info.

Bit the bullet & bought a vacuum gauge today.
Readings at idle are ~16-20 bouncing quite fast. Clears up at faster rpm to rock steady. At fast idle it clears a bit & drops when it "sputters".

The instructions sheet says:
"Needle vibrates rapidly at idle-steadies as rpm is increased."
"WORN VALVE GUIDES"

Looks like several hit it on the head.BTW,I do have WORN split guides.
Can't confirm,as I haven't fixed it yet, but the info with the gauge is pretty convincing.

Gonna start gettin ready for a rebuild, no use in just doin the valves!All the way.

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Hermit

01-14-2005 19:00:26




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 Re: Update: Sputtering diagnosis w/vacuum gauge in reply to rasputen, 01-13-2005 16:09:27  
Don't be too surprised if your valve guides aren't worn out. On the internet, there are several sites that show different reasons for your readings. I have some books that show other possibilities. If you really want to know the status of your engine, have someone with a engine analyzer (Sun machine) check out your motor. Then after you rebuild it, run it again on the analyzer to see the differences.

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rasputen

01-15-2005 01:00:28




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 Re: Update: Sputtering diagnosis w/vacuum gauge in reply to Hermit, 01-14-2005 19:00:26  
Good site about vacuum gauge diagnosis.
BTW...My readings are EXACTLY the rapid vibration at idle & cleans up as rpm is raised.
LOOSE valve guides.

No deviation. NO carb leaks!



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rasputen

01-15-2005 00:44:25




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 Re: Update: Sputtering diagnosis w/vacuum gauge in reply to Hermit, 01-14-2005 19:00:26  
Hermit, Thanks, but after seeing the guides & slop in the valves during a lapping job in 2001 I know for sure the are very worn.

The issue is the sputtering miss & the vacuum gauge shows a 2-3 inch hg drop when it sputters.

Also rings worn, but good power.



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Gordom in IN

01-14-2005 08:37:48




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 Re: Update: Sputtering diagnosis w/vacuum gauge in reply to rasputen, 01-13-2005 16:09:27  
The same problem can be caused by a small air leak at the carborator mounting flange and/or a small air leak at the intake manifold joint gacket. An air leak around a very worn carborator throttle shaft can also cause this. It might be a good idea to check for these leaks first. They are a "cheap fix" and easy to do compared to replacing valve guides that may not really need to be replaced and then you still have to fix the air leak/s anyway to make it run right. To do a complete rebuild just to fix this problem may be way over done and cost a lot. Have you done a compression check? If it has good compression on all cylinders, why do an overhaul? Does it use a LOT of oil? If not, why do an overhaul? Will it pull a load at full throttle? If it will, do you need an overhaul? If you must replace the valve guides you should be able to do that without "splitting the tractor". An overhaul is a lot more work and involves "splitting the tractor" to "do it right". (Grind crankshaft, check and repair or replace camshaft, clutch, etc.) I have seen some very worn engines that run quite well and give good service for years if the "littls problems" are taken care of. Good luck, Gordon

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rasputen

01-15-2005 00:36:50




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 Re: Update: Sputtering diagnosis w/vacuum gauge in reply to Gordom in IN, 01-14-2005 08:37:48  
Gordon,
No leaks in fully rebuilt carb (by me) and lapped carb halves, + new gaskets. I assure you no leaks carb or manifold. Actually that would not give the vibrating readings I got.

The engine needs a rebuild (#1=90 #2=75! #3=90 #4=90) leaks more oil than it burns. Pulls like a demon!!! Runs excellent under load, very worn split guides (lapped valves 2001).

I understand how & what of rebuilding, & I am restoring this 1947 8N, just been puting off the engine. Need it running good by March for mowing season. Logic is NOT an issue as it is my passion tractor & the money is not the problem.

I guess I wrote the message incorrectly, should have been "Yippie! finally found a problem-gonna use it as an excuse for full no expense spared engine rebuild."

Thanks for your concern, but I have no wife to require me to act grown up & justify my whims.

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Allan in NE

01-13-2005 17:00:00




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 Re: Update: Sputtering diagnosis w/vacuum gauge in reply to rasputen, 01-13-2005 16:09:27  
Ras,

Boy, I sure agree with ya. Do it right and that old Ford will run another 50 or 60 years.

I'm like you; a stickley for doing it right the first time.

Glad ya got 'er,

Allan



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