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Engine swap B230F to B23F, have compatability issues with M46-M47 clutch kits. 200

posted by  FitzFitzgerald on  Thu Jun 24 07:21 CST 2004
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last visit: Wed Jun 25 23:15 CST 2014
[RELATED]

This is a followup to post: http://www.brickboard.com/RWD/index.htm?id=810462

We have decied to use the B23F from the '83 240 to swap into the '87 240 (replacing the original B230F engine). Both engines are currently sitting side by side on the garage floor and I am in the middle of transfering the transmissions. The B23 came with an M46, and the B230 came with the M47-II (produced from '87-'93). We would like to keep the M47-II in the '87, but have it mated to the B23.

Of note, the B23 uses a flat 25 lbs. flywheel, and the B230 has a recessed (dished) 35 lbs. flywheel, -and both use different clutches and pressure plates that are not interchangeable and must mate to their respective flywheels. I'd like to avoid changing the flywheel from the B230 to the B23 as this would add an additional 10 pounds of rotational weight to an already (rotationally) heavy engine. -and thus make it seem like there is an additional 1,000 pounds of cargo weight in the car at all times when accelerating. (information source for flywheel weight and performance: Paul Grimshaw archives
Also, the M46 and the M47-II use different clutch forks, but the clutch bearings and pilot bearings are the same.

I've just test fit the M47-II to the B23 using the B23's original flywheel, clutch, and pressure plate. It seems to fit, but I'm wondering if any conflicts are going to occur when we try to drive it next week. Can anybody think of any possible problems (different clutch fork not going to reach far enough or not retract far enough, etc.)? I'm expecting this swap to work, but I wanted to post this question just to make sure.

Again, to clarify, are there any known conflicts with putting an M47-II onto a B23 and using the B23 clutch kit and pressure plate that were originally intended for an M46? (and using the original B23 flywheel)

Thanks for any help and advice.
God bless,
Fitz Fitzgerald.
--
'87 Blue 240 Wagon with 240,000 miles.






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