weight Question

JackConrad · January 09, 2009, 08:20:41 AM

I am getting ready to swap 8V71 engines in our MC-8. I have a dolly for removing the engine/transmission from our bus that a friend is loaning me. I will need to separate the engine & transmission and connect the transmisssion to the new engine. I plan to use 2 engine hoist to accomplish this, using 1 to stabilize the transmission and the other to lift the engine off the dolly and set the other one in place. Can anyone tell me the weights of the 8V71 and the Allison 740 transmission? Thank in advance. Jack

Sojourner · January 09, 2009, 08:30:40 AM

2310 lbs for 8v71n
Diesel Engine Specifications

Automatic Models HT 740

FWIW

Sojourn for Christ, Gerald

luvrbus · January 09, 2009, 08:33:24 AM

Jack, 2395 wet for the 8v71 and 840 lbs for the 740 dry good luck

luvrbus · January 09, 2009, 08:38:12 AM

Gerald, that page is not correct it has a 8v71 weighing more than a 8v92 fwiw

Sojourner · January 09, 2009, 08:46:05 AM

Quote from: Sojourner on January 09, 2009, 08:30:40 AM
2310 lbs for 8v71n
Diesel Engine Specifications

Automatic Models HT 740

Both are with the dip stick...LOL

FWIW

Sojourn for Christ, Gerald

kyle4501 · January 09, 2009, 08:55:49 AM

Don't neglect the additional weight of the various accessories.

I put a complete 8V71 on my trailer (has 2 3500# axles) & it took most of the suspension travel out . . .

I'd plan on at least 4000#. You don't need the added excitement of figuring out how to pick it up after the lift fails . . . .

Lin · January 09, 2009, 09:04:06 AM

I like what Kyle says. This is not something that I would do, but if I did I would be looking for a serious safety factor.

Brian Diehl · January 09, 2009, 04:48:07 PM

Jack, I used my 2 ton hoist to lift my ht754 with no problem. the ht754 is heavier than the 740 by about 100 lbs.

I also picked up my 6v92 without issues as well. (see my webpage for pictures of what I did with my engine replacement project)

You will have no problems as long as you go slow, connect you chains very well and always make sure you ask yourself the "what if" questions.

Why are you swapping 8v71s?

Utahclaimjumper · January 09, 2009, 05:54:09 PM

My 8V71 with all accessories and a VS2-8 trans weighed 3600Lbs.>>>Dan

chris4905 · January 09, 2009, 10:54:37 PM

Jack,

I have done this. Took the 8V71 & Spicer out of the back of my 4905. Had a 6V92 ready to put in.

I removed everything I could from the back end providing good access to the engine, then rented a forklift for a few hours. Cost me less then a hundred bucks. I'm glad I did, as the "nervous factor" climbs rapidly when you start to take the engine out.

I used my tractor bucket to take the Spicer 4 speed off the old 8V71 when it was out in the open. Then I used a 2 ton engine hoist to lift the V730 onto the 6V92 once I got the 6V92 into the bus. Again I rented the folk lift when ready to put the 6V92 into place.

I know your a little different, you may have to have the transmission attached and put them in together. I still vote for the forklift.

I used a pallet jack ($200) from Harbor Freight to move the engines around the shop.

Good luck, and be careful.

Chris

luvrbus · January 10, 2009, 04:58:25 AM

Jack, if the dolly is made like the one in the MCI manual it will be stable,just remove the transmission from the engine with it still on the dolly it makes a good workbench no bending over to remove the flex plate bolts from inside the little round hole above the starter. good luck

JackConrad · January 10, 2009, 05:53:09 AM

I plan to use a 2 ton engine hoist and remove Alternator from engine before lifting it from the dolly. We are changing engines because our 8V71 is getting tired. We had no records on this engine when we purchased the bus. We found another 8V71 with documented 42,000 miles since complete out of frame overhaul. This engine is complete with starter, PS pump, air compressor, cooler, air throttle, etc. It also is set up as 304/318 HP with Jake brakes.
I know most are changing to 4 cycle computer controlled engines, but for the amount of miles we put on the bus this will work for us. Installing any other engine would involve fabricating parts for intake and exhaust systems or looking for new/used parts. I don't feel I can install any other engine for what I will have in this one when all the littles extras are added into the final cost. Jack

Brian Diehl · January 10, 2009, 05:56:06 AM

Jack,

You are going to love the jake brakes!

Sounds like you have a good plan. Please keep us up to date on your progress. You might consider replacing your coolant hoses, powersteering hoses, and fuel lines at the same time....

Dreamscape · January 10, 2009, 05:59:06 AM

Jack,

Is your new 8v71 a T or an N? Just curious.

Paul

JackConrad · January 10, 2009, 06:19:10 AM

Quote from: Dreamscape on January 10, 2009, 05:59:06 AM
Jack,
Is your new 8v71 a T or an N? Just curious.
Paul

It is a N. I will take a bunch of photos of the swap process. Maybe it will end up being an article in Bus Conversions Magazine. Jack

weight Question

luvrbus

luvrbus

luvrbus