FJ40 transfer case V8 propeller support leak (1 Viewer)
- Thread starter FJ40Time
- Start date
This site may earn a commission from merchant affiliate
links, including eBay, Amazon, Skimlinks, and others.
Yes on supporting it with a jack. Drain the oil first. Check the mounting hardware while you have it off. There’s two in the case and three on the outside.
There is probably an OEM gasket for it- check with @cruiseroutfit. Second best would be FPIG.
The cone for the transmission output shaft it sticks out the back of the transfer case, as I recall.
Yes.
You need a cone there for some shaft on the inside, I forget it's name. But your cone is welded to the propeller support? Did it come that way or is that a mod?
You might try some longer studs and nuts instead of those bolts, which I don't know if they're long enough.
I got a similar prop support (and a case-saver) behind my TC, sure it leaks some.
FIPG is good for everything...
I had a that model propeller mount. It should seal fine. Studs would be a good idea.
Downey
SILVER Star
Advance Adapters made some the transfer-case rear motor mounts with a welded-on rear cone, not sure why, but it prevented use of the 40 pulse vehicle speed sensors for the LS guys who wanted to use the transfer-case mounted VSS. Definitely use studs and nuts, you can get them much tighter.
I seem to remember "one less gasketed surface to leak" as part of the sales speak.
I have the the mount with a welded cap and you still need to seal the bolt threads as well as the mount to the case surface. It just weeps if you don't.
GA Architect
SILVER Star
There is a weep hole that is supposed to be on the backside to let oil pumped to bearing drain back, it usually gets plugged and this happens. I always had it leak with bolts, went to studs, much better. the suggestion to check tcase mount bolts is a good one.
- Joined
- Apr 14, 2004
- Threads
- 1,449
- Messages
- 36,617
- Location
- 818-953-9230
- Website
- www.marksoffroad.net
I just got done rebuilding a t-case that had a propellor mount on it at some point. Three of the six holes were stripped out to about 1/4” depth, which is consistent with the original 20mm bolts having been reused. 
From your photo, it looks like you may also have stock bolts.
Add me to the chorus of people who recommend switching over to studs. Factory differential carrier studs are an excellent choice. And the end that gets inserted into the tcase already has thread sealant on it.
I’m not sure if I remember correctly, but I think the part number is 90116-10104.
From your photo, it looks like you may also have stock bolts.
Add me to the chorus of people who recommend switching over to studs. Factory differential carrier studs are an excellent choice. And the end that gets inserted into the tcase already has thread sealant on it.
I’m not sure if I remember correctly, but I think the part number is 90116-10104.
pbgbottle
Forum Lifer
Is that the Pardi Plate ?
leaky also. Haha.
Sorry, it’s been to long
OP, the stock bolts that held the oem cone cover on are not long enough and will destroy the case as Mark A noted. If not using studs please use longer hardware. The oil drain back hole needs to be functioning. When you remove the propeller mount to clean/seal backside please use a dremmel & drill and create a weep passage so the oil pumped into cone has somewhere to drain vs leaking as you see. You will see the oem passage in the aluminum case, the oem cone cover has a passage shaped into it that mirrors the passage in alum case. The A/A propeller mounts do not recreate this oil drain passage.
Living in the Past
SILVER Star
That torque setting is for the nut on the transmission tailshaft not five bolts. No FSM manual will have a torque setting for that aftermarket motor mount. Factory torque specs for the six bolts that hold a stamped steel cover with no load bearing would be far less than required for a rear motor mount. The weight as a rear motor mount would use studs. I know the Fairey overdrive that only supports the overdrive's weight off the back of the transfer case four of six bolts were replaced with studs.
