1958 PD4104 Trans Failure

uncle ned · April 15, 2016, 07:12:37 AM

I believe the turbo-ed one that I saw had the blower on the coach side and the turbo on the back side.

Will have to check with Boomer or Gene Russell to see how Gene did theirs.

I notices how the air was ran and could not figure out why.

uncle ned

Boomer · April 15, 2016, 08:47:55 AM

Gene put his exhaust manifold on the bulkhead side and mounted the turbo and bracket to the cylinder head on the front side. On mine the exhaust manifold and turbo are both on the front side.

chessie4905 · April 15, 2016, 11:11:45 AM

That pictured setup wouldn't work well on the 4104. Lots of room on bulkhead side for turbo mounted directly to exhaust man. That picture..pita to remove valve cover, but I don't know how the spaces available on a 3751. Looks like lots of room on top. Nice clean looking seup. Is that actually a silver 6-71?

gg04 · April 15, 2016, 02:47:46 PM

The pictured engine without the spacer under turbo is the same as mine, just different air intake, and exhaust. Pictures used to be on this board. All the Phoenix transit motors were the same on cradles with radiator, exhaust, and v730..S50's were just little longer package. Rdw

Don Fairchild · April 15, 2016, 08:23:31 PM

Chessie, you would think that would be the case but I have seen so many of the Allison and gm autos loose a governor and just stop.

Don

chessie4905 · April 16, 2016, 04:19:02 AM

Well at least it would be a simple check.

TomC · April 17, 2016, 10:41:03 AM

If I had a 4104 and wanted to turbo it, I would mount the turbo above the transmission. Just change the bulkhead side exhaust manifold to a single outlet (rather than the twin 3 cylinder some have) with the outlet at the rear. Then on the right transmission door mount the air to air intercooler with an electric fan blowing from engine compartment out (the big engine radiator fan is too powerful for an electric fan to overcome-as I found out with my aux transmission cooler with electric fan). Good Luck, TomC

Kirby-XL40-FL · April 17, 2016, 02:38:03 PM

Clark, the same thing happened to me some years ago in Wisconsin, with my 4104 running an 8V71 with V730 trans. The cause was, all the bolts with threads pulled out of the bevel gear carrier from the case. Fortunately, I had a spare transmission in the custody of a good friend who shipped it out to the shop where I landed after the failure. Good luck, Kirby

luvrbus · April 17, 2016, 04:28:30 PM

They are terrible about shearing the fly wheel bolts if they have not been updated

chessie4905 · April 17, 2016, 06:39:53 PM

The V730 flywheel I have in the shop is one heavy sucker. Hope it isn't the problem.

lwbclark · April 27, 2016, 09:19:24 AM

I just spoke to S&S and it looks like the flywheel has sheared so (at a minimum) an engine rebuild is in order. He also said that there may be another driveline issue at work here that's the root cause (bound trans or driveline vibration). The ballpark for a repair could be $30k, leading me to wonder if replacing is a better option than repairing. S&S will install but won't get involved in sourcing used drive components. Does anyone have any ideas on where to go from here? Since this seems to be an oddball drivetrain combo, I don't expect that I'll find a complete package. Is going used even a good option? Where would I start looking?

luvrbus · April 27, 2016, 09:27:30 AM

Quote from: lwbclark on April 27, 2016, 09:19:24 AM
I just spoke to S&S and it looks like the flywheel has sheared so (at a minimum) an engine rebuild is in order. He also said that there may be another driveline issue at work here that's the root cause (bound trans or driveline vibration). The ballpark for a repair could be $30k, leading me to wonder if replacing is a better option than repairing. S&S will install but won't get involved in sourcing used drive components. Does anyone have any ideas on where to go from here? Since this seems to be an oddball drivetrain combo, I don't expect that I'll find a complete package. Is going used even a good option? Where would I start looking?

I was afraid of that but was hoping it wasn't the case for you

muldoonman · April 27, 2016, 11:34:20 AM

Wow, did you say 30 grand for repair?? Hope it works out.

CrabbyMilton · April 27, 2016, 12:58:18 PM

Please forgive my ignorance here. But why would he need an engine rebuild? I always thought that flywheels are replaced all the time and it sounds like his engine is fine otherwise. That is a rare combo indeed for the 4104. I wonder what could have gone wrong unless a problem was building for awhile.

gg04 · April 27, 2016, 01:09:33 PM

Still a lot of 6l71ta ddec's floating around, complete with 730's. Plus S50 reverser packages are still out there. just late 90's transits. Easy swap.rdw