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Ford 9N, 2N & 8N Discussion Forum
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Yikes! No compression???

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Alan R

05-18-2006 16:54:27




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Took another look at verifying timing when #1 is on compression stroke. Couldn't feel any pressure. Tried pulling the bolt from the intake and checking for suction there...nothing. Now I'm really getting concerned, so I pull out the compression tester and check the #4 cylinder (easiest to reach)and get zero. Pull the #3 plug and check for compression...zero. This can't be possible! I could (maybe) understand low compression, but no compression? What's going on? This was an "in frame" rebuild (due to a blown head gasket) with new rod bearings, main bearings, rings, gaskets, etc. I did not remove the crank or cam. I have not fooled with the valves at all other than to check they were in good shape and opening and closing when rotating the crank during the rebuild. Seems unlikely they would all suddenly stick open? This is crazy. Other than telling me I should have pulled the engine for a complete teardown and rebuild (or replacement), what could have gone wrong and where do I go from here?

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Jetman8N

05-19-2006 06:27:57




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 Re: Yikes! No compression??? in reply to Alan R, 05-18-2006 16:54:27  
Alan,
I'd pull the #1 plug again, open the timing cover on the bell housing, rotate the engine until the timing mark is at "0". Pull the front valve adjustment cover off. If both valves aren't closed rotate the crank 360 degrees and verify the valves are closed. If they aren't, then the cam gear probably jumped a few teeth. May be one of the great fiber gears that give up a few teeth now and again. Will have to pull the front end off to replace it, but it's not a big job.
Jet

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FarmerDawn

05-18-2006 20:27:08




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 Re: Yikes! No compression??? in reply to Alan R, 05-18-2006 16:54:27  
Ohhhh nooooo, Alan. I can imagine how you must feel! Hang in there, fellow N-er!!! I know you can figure it out, and I bet it's something small and easy to fix!! Don't give up!!! --Dawn



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Alan R

05-19-2006 04:20:56




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 Re: Yikes! No compression??? in reply to FarmerDawn, 05-18-2006 20:27:08  
Don't worry, I've come too far to give up now. Not out of ideas just a bit frustrated. Thanks for the encouragement.



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FarmerDawn

05-19-2006 05:28:33




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 Re: Yikes! No compression??? in reply to Alan R, 05-19-2006 04:20:56  
Whew! Well, I will be thinking good thoughts for you today while you puzzle it out!



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TheOldHokie

05-18-2006 19:30:56




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 Re: Yikes! No compression??? in reply to Alan R, 05-18-2006 16:54:27  
If both valves are closed and the piston comes up you will get compression. If not you have leaking rings/leaking valves/leaking head gasket/etc. Given what you serviced I'd suspect the head gasket seal first. KISS.

TOH



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Alan R

05-19-2006 04:28:06




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 Re: Yikes! No compression??? in reply to TheOldHokie, 05-18-2006 19:30:56  
While I know the valves were opening and closing as I rotated the crankshaft during the rebuild, I do not know if they are opening and closing at the correct times. Is it possible that the engine "jumped time" or some other failure could have caused the valve timing to get this far off? The rings are new and the end gaps were okay and "staggered" around the piston during reassembly. The valves and seats were clean and undamaged. The head gasket surfaces were cleaned and the gasket was replaced and properly torqued. My bet is the timing is off between the crank and cam, although I have no idea what would have caused this unless it was that way when I purchased the tractor. Entirely possible since I bought the tractor as is with "may have a blown head gasket" according to previous owner.

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old

05-18-2006 18:15:38




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 Re: Yikes! No compression??? in reply to Alan R, 05-18-2006 16:54:27  
Did you prelube the cylinder/rings when you put in the new rings?? Also did you make sure the gap on the rings where off set from each other?? Had a guy come to me years ago and said he had liitle to no compression on a rebuild and I asked him about the rings and he told me he lined up all the gaps. He ending up pull all the pistons and resetting the rings. Just a guess and maybe an idea for you

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Alan R

05-19-2006 04:34:03




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 Re: Yikes! No compression??? in reply to old, 05-18-2006 18:15:38  
Yes, I lubed the cylinders and rings when reinserting the pistons, and the ring gaps were staggered around each piston (none lining up with each other). I'm thinking (or hoping) the problem is with the engine timing. Need to look into what could cause the timing to be off such that the valves open during the compression stroke, thus no compression. May have been this way when I bought the tractor, but didn't know it since I had to replace the head gasket before attempting to start it. Thanks for the reply.

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old

05-19-2006 08:25:07




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 Re: Yikes! No compression??? in reply to Alan R, 05-19-2006 04:34:03  
Did you by chance have the govanor off?? If you did, did you maybe get the bolts mixed up. One is longer then the other and if put back in wrong you can brake the govanor gear and of course that would mess up the timing



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