Gearbox – TMP 12000 – wanted

[Arild Jaeger]

I have problems with my gearbox.

Does anyone have a TMP 12000 that is no longer in use?

My e-mail is: arild.jaeger@gmail.com

[Moderator]

Hi Arild – what sorts of problems are you having? We still have our TMP 12000, so we are curious about symptoms to watch out for.

This year, we had the gasket fail on the top sender unit, but we were able to repair that ourselves. When the oil pressure is low, it won’t go into gear – we like that  feature as it protects the gearbox, and warned us that we should look for an oil leak.

Otherwise it seems to be running great, but we don’t really understand what symptoms might indicate impending failure.

[Arild Jaeger]

Hi Marilyn,

Our gearbox works well and we haven’t had any problems with it, except that now it looks like a little seawater is leaking into the reduction gear (i.e., the rear compartment) making the oil in there look a bit like dark milk.

I asked Graham Turner of Thamesway Marine Products what he thinks is the problem.  I understand that he thinks that the (moulded) aluminium between the coolant water and the oil has corroded and started leaking.  I understand that this is very difficult to repair without replacing the aluminium housing of the gear.

So far the amount of seawater in the oil is very little, but I think I will have to do something about it.

Anyone who has had a similar experience?

[Czarina Blue]

hi Arild,

when we overhauled our 4108 in Colombia we also looked at the gearbox and the mechanic identified degradation of the aluminium between the oil and coolant water zones. His solution was to dremel lightly then make good with cold weld epoxy (brands ‘JB Weld’, ‘Permatex Cold Weld’).
This is not ideal but I have found it useful also in my exhaust elbow air water mixer pipe, which have a notoriously short life. The last time I got my elbow refabricated, I coated the inside of the pipe where the worst corrosion occurs, where the seawater enters, with cold weld and so far it has lasted five years whereas normally it would last about three. Cold weld is not an ideal fix, but it might buy you some time whilst you continue hunting for a spare.
Best regards

Duncan

[Author]

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