Perkins 4107 - Gearbox problem

l'escargot

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Went to move the boat down the pontoon today. Engine running fine, engaged gear, no drive. Took the filler plug out of the gearbox and the dipstick was was dry. It took a litre and a half to get it reading on the dipstick again.

Now we've had the boat for just on two years and I have to admit I have never checked the level. I was going to do it, honest. The reason I was moving the boat was to put it on a more convenient pontoon to start doing all those start of the season jobs. So I can't tell whether the level has taken 10 years to drop to the level it has or there has been a rapid drop in a very short time recently.

Anyway, moved boat ok engine engaged and ran fine. Switched it off and thought I would recheck the level and the transmission fluid on the dipstick has gone from red to a cloudy light brown - I would guess emulsifying.

So how much of a problem do I have? A bit of condensation that has caused it and nothing to worry about or is it signs of something serious? Where should I be looking now?

The only slight nagging worry I have is that at the end of last season, there were partly emulsified flecks of oil in the exhaust water when the engine started up. I put it down to injectors/fuel pump and it seemed to disappear. Is it conceivable that the transmission fluid is going out through the cooler and there is water coming into the gearbox the same way? Did the flecks of oil in the exhaust water stop because the gearbox had emptied itself through the cooler? Or am I barking up the wrong tree?

Any help would be appreciated.
 
pressure in the oil cooler is usually fairly low, so water in is more likely than oil out.

red auto oil goes brown as ages,gets bits in it,etc after all you added oil to what was there. Therefore likely to be at least 2/3 old oil.

emulsified = white,usually pastey thick gloop.
 
On my 4107 I have a TMP 'box and that takes SAE20 oil.. are you sure that you are using the correct oil ?

The oil becomes aerated (as mentioned above) after running and the 1st time I checked mine immediately after running I thought the same that it was emulsified...after 30 mins or so all the little bubbles dropped out.

Once again assuming its a TMP....it has an oil cooler between the bell housing and the 'box... apparently this can corode through ( or poss crack if frozen ??) I got that unpleasant sounding bit of info from the chap at TMP in Weybridge....he also suggested getting rid of the copper piping that takes the raw water from the 'box cooler to the pump and replacing it with flexy stuff to avoid electrolysis.

Good luck..

Nick
 
It could be a PRm box as well ... Perk's are able to take a variety of boxs.

have to admit that my PRM hasn't had a look for years !! Must get round to seeing if Dipstick will actually come out !!
 
Now peeps understand why I posted ... without knowing what gearbox he has ...

To another who mentions oil change when engine ... I know - I have the book ! But my gearbox looks like a reject from the rubbish tip ! I'm afraid to unscrew anything on it !! Literally don't know if it will go back again !!

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I know I should sort it ... and I will - I promise !!
 
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Know any body who could test it /forums/images/graemlins/laugh.gif /forums/images/graemlins/laugh.gif /forums/images/graemlins/laugh.gif

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Ha Ha Ha !! I don't think I could take the embarrassment of placing a sample with my people ! There again - would be interesting to know what over 10yrs use has done to it !! /forums/images/graemlins/shocked.gif
 
I read in the 4108 book and TMP info that the saltwater feed to to both the gearbox and oil cooler were redundant if you don't go to 3K revs, so I took mine off. The gearbox was full of salt and sludge anyway...
So, going back to the original question, If I had the L'escargots experience, I would run the box for a while then drain and examine the oil for contaminants. (put it in a beer glass and let it settle). Also, where did it go in the first place? If it's a hydraulic actuator, the lack of drive is explained.
 
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I read in the 4108 book and TMP info that the saltwater feed to to both the gearbox and oil cooler were redundant if you don't go to 3K revs, so I took mine off. The gearbox was full of salt and sludge anyway...

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Yes I heard that about the gearbox cooler as well, but when i mentioned it the the TMP bloke he said he hadnt heard about that......so ...??

Nick
 
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thats me stumped then
quite intimate with the TMP /forums/images/graemlins/mad.gif & copper pipes /forums/images/graemlins/confused.gif

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Apparently if you have on your engine(as I do) a copper water feed from the gearbox cooler to the raw water pump, it can set up an electroysis issue with the gearbox casing...I didnt want to risk it so replaced mine with flexible plastic pipe.

Nick
 
The suggestion put to me today is that the drop in transmission fluid has caused the plates to slip and the contamination is the dust from the plates. So I am going to run it for a bit, see how it runs and see how quickly (or not) the level drops and where it is going to.

If it looses the fluid again it will need to come out for the seals or whatever to be done. If the level doesn't drop I might just replace the transmission fluid a couple of times and see how I get on. Either way probably time to start looking round for a recon/exchange gearbox.
 
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