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Wd45 compression

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Don

12-18-2002 00:53:22




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What should the compression be for a wd45 gas engine? Mine is running @ 90 80 80 90, I also get some backfiring as I try to use it even under very little load. Rebuilt the Mag. already and has new plugs and wires. Checked and the firing order is correct. Is there a way to check the governer?
Thanks
Don




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Keith

12-24-2002 18:41:15




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 Re: wd45 compression in reply to Don, 12-18-2002 00:53:22  
Don, Don't feel alone. Am having the exact same symptoms as you are. Also have run compression, and have 120. Carb is "not right", but everything else electrical and ignition has been replaced. Have also tried moving distrib. for change in timing with same results. Will compare notes as they occur. Sure is maddening. Work on it for a while and go back to the Red Tractors to retain my confidence and sanity.

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TimC

12-19-2002 14:07:02




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 Re: wd45 compression in reply to Don, 12-18-2002 00:53:22  
Moisture in distributor?



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Don

12-19-2002 17:33:46




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 Re: Re: wd45 compression in reply to TimC, 12-19-2002 14:07:02  
OH, HOW TIMING CAN BE EVERYTHING IN LIFE!!!
Couldn't find the timing mark but decided to change it a little at a time and it is running much better. Timing mark should be on the flywheel. There is a small square opening on the side of the bell houring where the flywheel is visable but there is not mark on the flywheel.
Anyways, has a lot more power now and I will keep experimenting. If anyone knows where that timing mark is Let me know.
Thanks again for all the help. You have all helped more than you know.

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chuckster

01-10-2003 07:19:17




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 Re: Re: Re: wd45 compression in reply to Don, 12-19-2002 17:33:46  
check under the bellhousing ther should be another inspection plate



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Willie

12-19-2002 06:28:09




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 Re: wd45 compression in reply to Don, 12-18-2002 00:53:22  
Don
A quick& dirty way to check the governor- tie a string to the linkage going into the carb. Pull the string gently while driving. If it responds the gov is giving trouble, if no change, the gov is okay. According to my book, point gap is .010 on mag, .020 on bat ign. Backfire thru carb USUALLY means lean mixture.
Side note- bought a WD last summer, ran smooth but no power. Turns out that roll-pin thru gear&gov shaft was part way out, hanging up gov weights, wouldn't let it operate. Spent an hour removing gov assembly & gentle tap with BFH fixed it.
HTH
Willie

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Dave

12-19-2002 05:51:28




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 Re: wd45 compression in reply to Don, 12-18-2002 00:53:22  
Don,I did'nt think 45's had mags just battery ign. If changed could be running a tooth off.My WD 45 had 65 psi on the low side but still ran smooth before rebuild



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Ron

12-18-2002 18:34:09




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 Re: wd45 compression in reply to Don, 12-18-2002 00:53:22  
You can use a timing light----aimed up at the flywheel from the bottom. I only remember one mark.....I center it in the opening, at full throttle. If you have 6 volts, you may need to use a 12v battery to power the timing light. When the timing is set right, the governors should be aggressive at anything over an idle..!!



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Don

12-18-2002 17:16:27




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 Re: wd45 compression in reply to Don, 12-18-2002 00:53:22  
I put a new cap on it. It could be the timing. I couldn't find a mark to time it so I "timed it by ear" Guess these aren't an old Chev. They say the timing mark is on the flywheel but danged if I could see it. The reason I checked compression is that it just has no power at all. Won't even pull itself up a slight incline, and very slight at that. Seems to idle smooth but not quick response when I give it the gas. Runs like you are trying to start in a higher gear than you should. (checked and I am not!!) I will check all I can and I appreciate all the comments.

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Don

12-18-2002 17:15:54




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 Re: wd45 compression in reply to Don, 12-18-2002 00:53:22  
I put a new cap on it. It could be the timing. I couldn't find a mark to time it so I "timed it by ear" Guess these aren't an old Chev. They say the timing mark is on the flywheel but danged if I could see it. The reason I checked compression is that it just has no power at all. Won't even pull itself up a slight incline, and very slight at that. Seems to idle smooth but not quick response when I give it the gas. Runs like you are trying to start in a higher gear than you should. (checked and I am not!!) I will check all I can and I appreciate all the comments.

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punchie

12-18-2002 13:52:26




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 Re: wd45 compression in reply to Don, 12-18-2002 00:53:22  
HI Don

I would say it is the timing, or points. Double check both. Some of the wd etc. are not going to run if cold, someone else has talk on that too. Bad gas ? Governer trouble may not idle or pull right , when you would give it gas it would act funny. Good Luck!!
Punchie



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Don

12-18-2002 22:55:37




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 Re: Re: wd45 compression in reply to punchie, 12-18-2002 13:52:26  
In this forum the tune up specs say the points should be set at 20 but inside the magnito it says 30 so that is what I set them at. Should I change them to 20?



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Steve in N.J.

12-19-2002 15:25:30




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 Re: Re: Re: wd45 compression in reply to Don, 12-18-2002 22:55:37  
My books all say .020 for mag. That's what I've been setting them at when I rebuild em' for my customers...
Steve B.



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Dave in Mo

12-18-2002 09:38:54




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 Re: wd45 compression in reply to Don, 12-18-2002 00:53:22  
Backfiring under a load sounds like the mixture is too lean. The governor will let more air in thru the butterfly and not enough gas is going with it!
If timing were an issue, it'd backfire without a load too at higher RPM seems to me.



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Steve in N.J.

12-18-2002 06:12:56




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 Re: wd45 compression in reply to Don, 12-18-2002 00:53:22  
Don,
Is it backfiring in the exhaust or intake side?
Recheck your mag timing from the rebuild. Couple other things to check that would cause a backfire and no power:
Fuel delivery- (lean) carb or fuel flow problem
Valve train- tight/loose valve, or chunk of carbon under a valve, worn cam. One new Champion spark plug out of four if used. Someone else I'm sure can help ya with the governor. Hope those suggestions can give you something to go on.. Steve B.

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Ron

12-18-2002 06:04:39




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 Re: wd45 compression in reply to Don, 12-18-2002 00:53:22  
The WD-45 is pretty "Cold Blooded"....needs to warm up or they will "snort-and quit".....!!!!! Any chance you need to check the valve adjustments.?? Compression sounds good... They don't "like" ANY water in the sediment bowl, either... Also....the Mag cap may need looked at--might be "cross-firing"....Carbon-tracking...



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Brian g. ny

12-18-2002 13:07:14




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 Re: Re: wd45 compression in reply to Ron, 12-18-2002 06:04:39  
Very few manufacturers of autos or tractors specify the compression on their engines. Most only say their should not be more than 10% difference between the high and low readings. Allis-Chalmers (with their WD-45) is an exception. According to their manual compression should be 125# @ 500 RPM. I would say however, that your compression is acceptable for an old tractor with lots of hours. I agree with the other comments; timing, carb. adj. and valve lash.

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