Transmission Leak

[Rockjumper]

Looks like I have a leak in the ZF transmission which is mated to my Volvo 260. Guessing it's the input shaft seal or, possibly the case seam. Definitely not coming from the filter, hose fittings or breather vent. For now I'm getting by with an absorbent diaper and periodically adding a few ounces to top off the unit.

I'd like to get a permanent fix done before this summer. Anyone been through something similar?

 

[BB marine]

I have experienced reverse gear leak issues in the past. Most repairs will require the reverse gear removed to repair a leak. Below are areas I would check to confirm where the leak is.

All hose connections at reverse gear and reverse gear cooler
All hoses
Filter cover oring
Shift control valve gasket
Case vent
Inspect all case plugs for leaks

All above leaks areas if found the repair can be made with the reverse gear in place.

Case split line is a metal to metal fit and a Lock tight 518 sealant is used during gear case assembly. If you find that the leak is at the split line the cases will need to be pulled apart cleaned , checked for flatness and then resealed with 518 loctite

Input or output seals. The output shaft seal if leaking should not be hard to determine you will see oil below the shaft area. The input seal will show evidence of leaking at the split line of the revere gear to adapter plate make up.


When inspecting for the leak you must spend time cleaning every area of a possible leak source. It must be fully wiped down and no oil residue. This will help you find the leak. The leak may not be a bad leak so looking for a drip may not work. You will need to clean and dry the complete case then start the engine using a mirror and a paper towel start looking for the source. Once you find the source this will determine the plan to repair.

 

[Rockjumper]

Thanks BB, I'll clean it up and do some more investigation with a mirror.