Volvo Penta (5.0GI PBYCCE) Drive Leaks Down

I have the following Volvo Penta Engine/Outdrive on my 1998 Cobalt 220:

Engine Type: 5.0Gi PBYCCE
Outdrive: DP-S1

The outdrive leaks down over a period of a day. I have not seen any issues with bringing the drive either UP or DOWN. Sometimes it will stay in the UP position, but most of the time will fall back down to the Motor support clips (of course, the clips are there only when the boat is on the trailer) like the one on this link...

iBoat Part Number: 18-9098 (Motor Supports - Sierra)
http://www.iboats.com/Motor-Support...8451699--**********.905916747--view_id.187479
I have looked for leaks from the Power Trim Motor all the way to the Cylinders and there is no visible sign of leak on connectors or the hoses.

I think the leak is internal to the Power Trim Motor/Tank, and have been searching this forum for anyone else who may have had this problem and a possible solution.

Any advise or pointing to a Forum thread on the topic would be greatly appreciated.

thanks in advance
rd

Re: Volvo Penta (5.0GI PBYCCE) Drive Leaks Down

The pump is the usual cause of the problem, I say usual in that I have replaced many pumps to fix the leak down problem, and never had a cylinder leaking internally. Volvo has no parts or instructions for repair of the pumps.

Re: Volvo Penta (5.0GI PBYCCE) Drive Leaks Down

For Education purpose: what are the mechanic's of this type of failure in the Motor? When calling for trim up or down, the motor is doing the job, however it seems to me , that the High Pressure side of the system is leaking back into the Low Pressure/Reservoir side (since there are no leaks in the system). So I was thinking that the suspect is the Valve housing (Figure #22 to #43) in the link (http://www.volvopentastore.com/Powe...*****.434237258--store_id.366--view_id.779331) between the motor and the reservoir.


To Replace the PowerTrim Motor: So, when I go to replace the motor, are there any O rings that I should replace as I have this Motor/Valve/Reservoir assembly removed from the boat?
Is there a procedure on how to remove the connectors/hoses off the pump? I read somewhere that before removing the Connector/Hose (Figure# 79) from the pump, to have the Trim in the highest UP (or OUT) position. This is to ensure that most of the fluid is in the cylinders and not in the reservoir. Anything else that I should be thinking about? How can I make sure that I have the right part number for the motor? Here is the information off the Drive: Product #: 3868690; Type: DP-S1; Ratio: 2.32; Serial No.: 4112044904

Any advise/thoughts on waiting till end of the season to do this work, as the trim Pump/Motor is doing its job right now? I think I can live with this small issue for now... but do not want this issue to cause other problems before I replace the motor.

Re: Volvo Penta (5.0GI PBYCCE) Drive Leaks Down

Are you sure your pump looks like the one in your parts breakdown?
I was under the impression that the LK model was the last to use that pump.

Re: Volvo Penta (5.0GI PBYCCE) Drive Leaks Down

Yes, Visually confirmed. I have not taken it off the boat yet, but the reservoir is on the top of the valve, and the motor on the bottom.

I can take a few pictures and post it to this thread.

Re: Volvo Penta (5.0GI PBYCCE) Drive Leaks Down

No, pictures aren't necessary, Just wanted to make sure because that pump isn't even shown in the service manuals for the BY models. The pump you have is not the one I was referring to.