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IMPORTANT: Forgot to mention how I managed to do this while maintaining the OEM length/position of the assembly. BEFORE you cut/weld anything (and the cutlines around the beam are marked) do the two bottom side(in pic) cuts first before you weld on the lower (arch) center section. Remember to also subtract the thickness of the end cap material you chose, if you cap them. These two undercuts will make cutting out that center section a breeze after the new arch is welded on, ensuring that OEM dimensions of the unit are maintained. | First mod done. Measurements taken with the engine/trans sitting in place with the mount sitting in position (plumb under bolt holes in chassis). As it turned out our focus on installing the engine/trans as close to 'level' as possible, while ensuring sufficient ground-clearance, caused two issues: the 7" estimate to allow oil pan clearance was inadequate and the power steering pump is contacting the top corner of the end of the 4" beam. I will post a drawing of the finished mount when the corrections are made. | Extraneous stuff hacked off, ready to be surgically altered to hold a Cummins. There's pro's & con's to choosing to go with the OEM engine mount. One 'pro' is that you can leave the chassis support for the port-side mount in place and use it as is. One potential 'con' is that I'm not an engineer so there's considerable uncertainty (risk) that goes with this route. So I'm thinking 'over-build' to mitigate the extra torque and 400-lbs that the 12-valve brings to the party. Preliminary measurement dictated that the center section of the main beam needed to be lowered about 7" to allow clearance for the oil pan. What follows is how I addressed that. | OEM FMC engine mount cross member - unmolested. |
The aforementioned coveted Chrysler 727 transmission mounted park-brake drum with 23-splines, before the drum is machined off. | Where you end up if you don't machine it off. | I wanted to briefly revisit the brake drum yoke adapter that Billy and Lou came up with to simplify connecting the output shaft of the 47RH and enable the use of the short 8" OEM FMC driveshaft. You can find these quite readily available with a little searching as they (the transmission mounted park-brake) were used extensively on the old 727's in 70's era motorhomes and some med duty trucks IIRC. You'll know you've found the right one if it has 23-splines. Bill also advised that you can shave off another 1/2" or so by machining off the smooth inside end of the unit that has no splines. With a 12 valve swap, every little bit of driveline length you can save is crucial; however, I decided to leave it on this one as I feel it'll be slightly stronger left intact. I'll eat the 1/2". | |
KILLER DOWEL PIN (KDP) done by a PO of this engine. If you know where to drill and tap the 1/4" bolt, it does the same job as the $100 plus kits out there. The important thing with a 12 valve is to confirm if it has been done or not. | Here you can clearly see the KDP just behind the black bolt that was threaded into the aluminum casting to block the KDP from coming out of the hole then dropping down into the gears. This is a different way to remedy this as the usual kit involves using the hex bolt to the right to fasten a metal restraint clip over the pin. The way this was done, conceivably could be done without even removing the timing cover if you knew exactly where to drill and tap the hole. | NOTE: I'd be remiss if I didn't add a reminder about the imperative confirm that the KDP (killer dowel pin) and the exhaust valve springs have been done on your 12 valve. The latter only required if you are going to run an exhaust brake. We did the exhaust valve springs (60-pounders) and confirmed the KDP pin had been addressed. | New seals and yoke nuts done, now torque the yoke-nuts back and get this sucker back home where she belongs. Note on the pinion nut torque: After a lengthy discussion with Gord, at WestCoast Gear in Vancouver BC., I took his advise and nearly halved the previous torque spec (from 600 ft/lbs down to 350 ft/lbs) on the pinion yoke nut. He's rebuilt hundreds of gear cases for all kinds of heavy equipment and he was positive that 600 ft/lbs was far more than necessary. Again, this only his opinion and I happen to agree. What you chose to do is your business. |
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