how to time a 70

[Anonymous-0]

ok guys Im gettin ready to put the ol girl back together but I have a horrible manual...I didnt know if you guys could give me a lesson on how to time the tractor...the distributor is off the tractor so I need to start from scratch...any help is appricated...thanks!

 

[Anonymous-0]

Are you just talking ignition or the cam and crank as well? First of all, all model 70 tractors when new had a mag. So timing marks for the ignition are a ll for a magneto. Now you need to help me a little, is this a Delco or a Mallory distributor? Is it a 3 gear or a 5 gear engine?

 

[Anonymous-0]

Sorry about the confusion, I am just talking about the ignition system. It is a delco distribuitor but someone has changed it to a coil. The tractor is actully my cousins and Im trying to help him out, he got the tractor in a basket pretty much so its difficult to put stuff back together(seeing as Ive only delt with Farmall). His poor excuse of a manual did mention something about timing marks on the flywheel but that was about it. Its a 44 70RC if that helps, and like I said its got a coil(if that changes anything) Thanks!!!!

 

[Anonymous-0]

P.S. how do you tell if its a 3 or 5 gear engine???

 

[Anonymous-0]

All distributors use a coil somewhere. Now: Clean the flywheel and lay out about 20-25 degrees on the flywheel before top dead center. I would make a marker every 5 degrees and paint the lines you stamp there each a different color unless you have a number punch set and then I would still paint them. You do remember basic high school math on how many degres in a circle and how to lay them out, Right? Does you intake manifold have a 1/8 inch pipe plug in it right above the carburetor mounting flange? If not it would be wise to drill and tap for one. More questions? J.

 

[Anonymous-0]

why would I drill and tap a hole in the intake??...what is its purpose???...my biggest question is this...to time it I bring #1 to TDC and then what?...drop the distruitor in the housing and have it so the rotor will contact the #1 plug wire??...I guess Im just confused on why I would mark the flywheel like you explained...Im not doubting your method in anyway but Im still not clear on this...sorry for all the silly questions...thanks

 

[Anonymous-0]

You have the basic idea. Bring it up to TDC #1 compression stroke. Then put the distributor in and rotate it so the points just start to open on #1. The reason for the degree marks is if you want to use a timing light to final time it your mag mark will not work so you need to provide a reference. The advance on the distributor will be different than the impulse angle on the mag(mag mark on the flywheel. The reason for the pipe plug is so you can use a vacuum gauge to fine tune it when you are finished and want to have it running at the best point.More questions? J.

 

[Don-Wi]

That vacume thing peaked my interests for my 1600. About what kind of vacume would a guy look for? I've got a vacume gauge somewhere, I may have to try to find it and hook it up...

Donovan from Wisconsin