Re: Farmall B-clarification needed

Posted by Patrick Martin on August 12, 2007 at 13:39:52 from (74.234.92.107):

In Reply to: Farmall B-clarification needed posted by Dave H (MI) on August 12, 2007 at 12:44:55:

Well you don't tap the side where the pushrod is. That side will have no movement in it until the engine rotates. If you hit on the pushrod side you will be hitting against the tappet which is seated on the cam. Do NOT hit on this side. Worst case would be a bent pushrod or dinged cam.

What I think he wanted you to do is to tap on the side of the arm that contacts the spring and valve stem. What you are doing is checking for stuck or sticky valves. Each one should bounce right back up smoothly. If that is cool and each is free then move on to setting intake and exhaust clearances.

Rotate the engine over by hand (use the hand crank if you have it or make one with a section of steel rod or pipe and drill a hole in the end and insert a 1/4" pin through it to engage the cam on the front engine pulley) and bring each piston up to Top Dead Center. This will be the compression stroke, you will notice that when you do this both rockers for whichever particular cylinder you are working on will not move (remain down) as the piston moves upward in the cylinder. You can insert a screwdriver or stick or something in the spark plug hole to let you know when the piston is at TDC. It will move it when the piston is all of the way up. Once again, BE SURE THIS IS THE COMPRESSION STROKE. Both rockers for that cyliner will not move at and will both be down.

Loosen the jamnuts on the pushrod cups (the side of the rocker arm that has a nut with a threaded part with a slot sticking through it) and back them off till the rocker has a little up and down play to it. You should have no spring tension on it and the end that contacts the valve stem should have clearance.

Now get your feeler gauges out and slide a .017" gauge between the valve stem and rocker. Use your screwdriver and turning clockwise, thread the pushrod seat down until you feel the opposite side of the rocker bump the feeler between the stem and rocker itself. Hold your screwdriver where it is and use your 9/16" box end wrench to snug the jamnut down. Do both valves for this cylinder this way, they can both be set at this time.

Do this for every cylinder and you will have set your valves. Once done, crank the engine up with the valve cover off (don't worry, oil will not shoot everywhere) and let the engine ome to full operating temperature. Kill it and go back through them the same way as above. The goal here is to set the valves to .017" with the engine hot.

I hope that is explanied fairly clearly. I don't know how familiar you are with engines but I tried to be as basic as possible. Let us know how it turns out bud!

Replies:

Add a Reply Name: E-Mail: Subject: Comments: Optional Link URL: Link Title: Optional Image URL: Email Notification: If you check this box, email will be sent to you whenever someone replies to this message. Your email address must be entered above to receive notification. This notification will be cancelled automatically after 2 weeks.

TRACTOR PARTS	TRACTOR MANUALS

We sell tractor parts!  We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]