Does the gear box need to be water cooled?

[JordanBoon]

i have a Volvo MD6A with a MS gearbox 1.91:1 ratio, i have been told that i can bypass the gear box cooling system for a short while as long as it does not get to hot.

It will only be used for getting out of the marina and back in again

Looking for MD6A gearbox if anyone has one

Thankyou

JordanBoon

Muscadet, Southsea

 

[scottie]

Is it because the housing is cracked?

 

[JordanBoon]

Yes the housing is cracked at the bottom and due to rust the bolt and housing have fallen off, the boat can be driven but water constantly drips / flows from the water cooled area of the gear box

 

[Bilgediver]

i have a Volvo MD6A with a MS gearbox 1.91:1 ratio, i have been told that i can bypass the gear box cooling system for a short while as long as it does not get to hot.

It will only be used for getting out of the marina and back in again

Looking for MD6A gearbox if anyone has one

Thankyou

JordanBoon

Muscadet, Southsea

I suspect that you can run the engine for quite a while here in the UK before any overheating of the thrust area of the gearbox occurs. This would be especially true if the revs were not held over 1500. I suggest you try and see how warm it gets and take it from there and report back.


It is a good idea with old Volvo's to flush antifreeze through the sea water passages before layup to prevent freeze cracking of the passages. Mind you last winter you d have needed a good strong mix

 

[JordanBoon]

Would you advise self magnamising tape as a temporary solution

 

[monkfish24]

why not try some metal filler or one of those epoxy putty sticks

 

[vyv_cox]

Would you advise self magnamising tape as a temporary solution

I agree with Bilgediver, I would be very surprised if the gearbox on a relatively small marine engine in UK got hot enough to need water cooling. Just check it occasionally with your hand, if you can't touch it it is over about 55C. The limitations will be firstly the seals and then the oil, both good for over 100C.

I would use one of the underwater epoxies for a short-term repair of the water side. It's strong and sets quickly, available at most chandlers. No good if it's oily but fine with water, fresh water wash to get the salt off.

 

[rosie]

MS Gearbox

I have an MS gearbox for sale. PM me if interested.

Dave.