Diesel Motor Removal/Transmission/Oil Pan

[Plymouth Sailor]

Bought a Irwin 28 in 2021 with the understanding that there was an oil pan leaked on the diesel. I decided to use the engine as is for a summer then go through the arduous task of removing it. The diesel runs great however the bilge obviously fills with engine oil slowly. During the course of the summer the transmission has seemingly gone as it wouldn’t shift into gear (sailed her right to my mooring). Question for those who have removed an engine and transmission. Is it difficult to remove the transmission (my next step)? The engine is a 25hp Kubota diesel don’t know what the transmission is.

 

[dlochner]

Haven't removed a motor, yet. I have removed a transmission. Assuming you can get good access to the mounting bolts it is a simple task. Disconnect the shift cable, separate the flange from the transmission, and removed 6-8 bolts depending on the transmission. pull the transmission away from the engine.

There will be a spline gear that slides into the flywheel and through the damper plate. Here are a couple of photos of my transmission when it was removed last year. Never mind the broken mounting plate, that's a long story. The spline gear and the damper plate are visible.

 

[Plymouth Sailor]

Haven't removed a motor, yet. I have removed a transmission. Assuming you can get good access to the mounting bolts it is a simple task. Disconnect the shift cable, separate the flange from the transmission, and removed 6-8 bolts depending on the transmission. pull the transmission away from the engine.

There will be a spline gear that slides into the flywheel and through the damper plate. Here are a couple of photos of my transmission when it was removed last year. Never mind the broken mounting plate, that's a long story. The spline gear and the damper plate are visible.

View attachment 213868


View attachment 213869

Thank you, I would imagine there is also sealant between the engine and trani?

 

[dlochner]

Thank you, I would imagine there is also sealant between the engine and trani?

No. There are no fluids in the space between the transmission and engine, so no need for fluids. Also, it is important to have no movement between the transmission and the engine, thus metal to metal contact is best. If there is movement, the mounting plate can crack. Do put a little grease on the spline gear.

 

[PaulK]

Before you take the transmission off, make sure the problem isn't in the control cable. We had ours break at one point and we were unable to engage or disengage the gears with it. But the handle on the side of the engine transmission still worked fine. We just had to have someone down below to move the handle when the helms person yelled loud enough to be heard over the engine.

 

[jssailem]

Paul. I know you said your engine is a 25 hp Kubota. Looks a loot like you have a Perkins 3.152.

Either way, based your boat model, I am guessing the transmission is in line (sits between the engine and the Propshaft). Looks like you have separates the engine&transmission from the Coupler flange.

The transmission is attached to the engine as @dlochner's images indicate. 6-8 bolts/studs with nuts. Care is needed to remove these. They are likely heat hardened from years of rust and use and can break. Lots of penetrating oil of choice and less brawn would be my path. If lucky ( and perhaps some of that leaked oil) the nuts or bolts will release. I used a small battery impact wrench on my 48 year old engine/transmission. I got lucky. You look to have much better access than I did.

Since you have the engine released from the boat, I would try to lift it out and work on it in a shop rather than fighting the confines of the boat. This will give you access to all parts of the engine that need your attention.

If it is a Perkins, they have a history of oil leaks. Their seals were marginal and when placed in a boat the leaks were more obvious than when they were on a tractor in a farm setting.

 

[Plymouth Sailor]

Paul. I know you said your engine is a 25 hp Kubota. Looks a loot like you have a Perkins 3.152.
View attachment 213870

Either way, based your boat model, I am guessing the transmission is in line (sits between the engine and the Propshaft). Looks like you have separates the engine&transmission from the Coupler flange.

The transmission is attached to the engine as @dlochner's images indicate. 6-8 bolts/studs with nuts. Care is needed to remove these. They are likely heat hardened from years of rust and use and can break. Lots of penetrating oil of choice and less brawn would be my path. If lucky ( and perhaps some of that leaked oil) the nuts or bolts will release. I used a small battery impact wrench on my 48 year old engine/transmission. I got lucky. You look to have much better access than I did.

Since you have the engine released from the boat, I would try to lift it out and work on it in a shop rather than fighting the confines of the boat. This will give you access to all parts of the engine that need your attention.

If it is a Perkins, they have a history of oil leaks. Their seals were marginal and when placed in a boat the leaks were more obvious than when they were on a tractor in a farm setting.

Thank you, will be working in the boat as it’s heavy enough that I just don’t want to deal with hoisting it out and safely landing it outside then in my basement. But I agree, the best place to work on it is out of the boat.

 

[Michael Davis]

I’ve removed and reinstalled two motors , a 5411 in a Ericsson 28 and a Perkins 4-108 from a Fast Passage 39. In both instances we used the boom and a come along for the job. Doing major work on an engine in a boat is very frustrating . Removing the engine is a piece of cake compared to the frustration of working in confined spaces of most boats.

 

[Plymouth Sailor]

I’ve removed and reinstalled two motors , a 5411 in a Ericsson 28 and a Perkins 4-108 from a Fast Passage 39. In both instances we used the boom and a come along for the job. Doing major work on an engine in a boat is very frustrating . Removing the engine is a piece of cake compared to the frustration of working in confined spaces of most boats.

True, however I was able to move the engine to both of its sides and remove the oil pan (found pin holes) and next the transmission (”trani” in New England).