87 to 89 swap

I just purchased an 89' 2001 minus motor and transmission. I have my complete 87 I planned on swapping the motor, transmission, and shaft assembly out of. Are there any major differences or problems I may run into along the way? I understand the 89' came with a different ratio drivetrain (1:1?) and standard rotation motor. Thanks for any input guys

Use the prop from the 87 and might need the transmission mounts from the 89...

So I just got the motor from the 87 dropped into the 89. Keep in mind, this is the 351 and transmission from the 87 along with engine and transmission mounts. The motor mounts went in without a hitch, but i've got some issues with the transmission mounts. Each mount is approx. 1/4" back toward the stern from the original mounting holes. Were the 89 transmissions mount a little further inset toward the bow of the boat? Currently scratching my head on how to resolve this issue......

Several have put 1.23/LH engine in place of a 1:1/RH, the footprint is reported to be the same. I can’t see why doing the opposite would be any different. Pics would help- presumably your pinch bolts are all loose allowing in/out movement and free rotation on the trunions?

I am not following Pete’s suggestion. IF it’s determined that all is ok and your trans mounts don’t line up with the old holes, then you can just match drill new ones and bolt it in place.

8122pbrainard wrote: "match drill"? The new holes are within 1/4" of the old so, the only way you could drill new holes would be to remove the cradle and weld up the old holes.

Why?

MourningWood wrote: I think the concern is the end result will be 'slots', not holes.

Though that was probably what Pete was thinking, I'm with TR - not necessary to go to that much trouble and headache. The only way I could see an even slight concern would be if the vacant 'slot' was toward the bow.   Toward the stern as they are, that same slight concern would only be such if he plans on doing a whole bunch of full throttle starts ... in reverse.

TRBenj wrote: It’s not uncommon for marine engine mounts to be slotted, once the bolt is torqued, it’s not moving. http://www.foreandaftmarine.com/DF-236M1.htm

Those slots run in the wrong direction! I sure wish the THEKINGoo posted a picture!!

8122pbrainard wrote: TRBenj wrote: It’s not uncommon for marine engine mounts to be slotted, once the bolt is torqued, it’s not moving. http://www.foreandaftmarine.com/DF-236M1.htm Those slots run in the wrong direction! I sure wish the THEKINGoo posted a picture!!

I could have sworn I’ve seen mounts with 2 slotted holes, one slot fire/aft and the other side to side. Not sure why it would matter anyways. The PCM mount holes are a little oversized and would allow more movement than you’d want if the bolts loosened up. Tighten them all down and all should be fine.

I’m still curious why the holes don’t line up though... they should.

Just tighten it down good and forget about it as others have stated. My engine mounts are slotted one direction and the trans and engine bracket castings are slotted the opposite direction. I feel certain that the high performance guys (Tim, Joe, and others) are not concerned nor have their engines shifted.

Since Joe in Kansas had his cradle out for beautification purposes I asked him to take some measurements on his cradle.(PCM 351 with 1.23 PCM transmission)

He had

4 inches center to center between the holes for the front mount.

3 1/4 inches center to center between the holes for the rear mount

23 inches center to center between the front hole in the front mount and the rear hole in the rear mount.

I went out and measured the same distances on a PCM with a B/W 1 to 1

The mounts numbers were the same 4 and 3 1/4 but the distance between the front and rear holes was 23 1/4 inches. I measured a few times to be sure since this was in a boat and not the easiest thing to do.

So............just like the KINGoo ran into there was a 1/4 inch difference.

So 2 different people using 2 different rulers but what I came up with is what the KINGoo did.

I would think the mounting angle difference and the rotation of the mounts due to this might account for the difference. (I'd have to think about that for a while)

So anyways for KINGoo, drill new holes like was said previously and you shouldn't have any problems.

[QUOTE=THEKING00] I pulled measurements on the 87 cradle and the 89 cradle and was expecting to run into this problem when I dropped the motor in. /QUOTE]

Just think,if you had mentioned that in the previous post we wouldn't have had all this fun measuring

At least it's been verified that there's a difference.