kerbyg

My '86 4.9 300 I6 threw some rods; it was A/T. I'm replacing with a M/T '86 4.9 300 I6. We pulled the M/T off the "new" engine and are having difficulty getting the A/T flywheel to line up with engine to bolt back on.


Recommendations please.


Thanks!
Guy

Braggs

Just to make sure you know... Automatic transmission uses flexplate. Manual transmission uses flywheel. You need to use the flex plate off the old engine too.

Here's a PDF that shows the different versions of flexplates and flywheels used on Ford engines. You might have a mismatch.

http://www.bcbroncos.com/ford%20starters.pdf

kerbyg

Thanks Bragg, being a non-mechanical type I didn't know that; I can go home now, I've learned something today

Braggs

Those bolts holding on the flex plate are going to be tough to get off. I use a screwdriver stuck in one of the holes to prevent the flywheel/flexplate from turning while I use a long cheater bar. If you're very unlucky, they might have used a special thread locker (usually red in color) that requires heating with a torch before it will release. You should use thread locker when you bolt it onto the "new" engine.

... and you're going to have to remove 2 of them.

Best of luck in your swap!

PS: while you're there, you should probably replace the oil pan gasket and the rear main seal.

kerbyg

We got all the stuff off, its just trying to get A/T flexplate to line-up to "new engine. We got as far as 4 bolts and then last two seemed to be off

Braggs

Ah, yes. One bolt will be offset from the others. This is because the flexplate has a weight on it to help balance the crank and the flexplate has to be rotated to the correct position. You will need to remove the bolts you have in and rotate the flexplate until all the bolts holes line up.

kerbyg

Got her done. Transmission and engine married up with carb and starter on also. Thanks for help.