Westerbeke JS Transmission

[sailor_andy]

Hi everyone,
I have a Westerbeke 42B4 engine with a JS Transmission. I have recently been having problems getting into reverse. I have flushed the oil (it uses SAE30) and tightened the cables. I use a single lever throttle. It appears the throw arm is moving it's complete range to the mechanical stops. I have never had issues with this up until now. This is just a last ditch effort to see if anyone has had this problem before I pull the transmission. It normally works fine when the engine is cold, although not always, but is intermittent after warming up.
Any suggetions appreciated.

[bmm32005]

Is it the JS BW-7?

[sailor_andy]

Yes it is. That was, I beleive, the standard fit when the boat was built.

[GordMay]

FWIW ➥ http://www.earlhill.de/files/ZF_BW7_Workshop_Manual.pdf

[bmm32005]

I've had mine apart twice for an issue with the conical bearings in the bell housing that the gear attaches to. The bearings are held in place with a Loc-Tite product and they tend to let go and spin. I ended up buying a new Newage PRM 120. I have a 38B4 Westerbeke. Great engine not so good tranny since I only had 500 hours on it.