Friday, May 3, 2024

M25XP Damper Plate replacement Pt.5

Day 4 - Lifting the M25-XP Engine

This is the target!
The Universal M24-XP Engine Damper Plate

It connects the Flywheel to the Gearbox input shaft, the springs act a shock absorbers between the engine - a 3 pot diesel - to the Gearbox which likes to have a nice smooth input.

Prior trips to the boat this week involved removing the Starter, Alternator, Heat Exchanger and all of the hoses and electrical connections to the engine as well as the Throttle, Gear Shift and the engine shut of cables. 

Today after getting the boat setup for the engine removal, I disconnected the drive shaft coupling and removing the 4 engine mount nuts that were holding the engine down.

To lift the engine, I put a 4"x4" piece of wood across the cabin companionway just aft of the cabin top winches. Then I setup a 500lb chain hoist from the wooden beam to the engine.

The Beam was just forwards of the center point of the engine lifting line, so as the engine raised off of the mounting bolts, it shifted forwards. I noticed that there was still an electrical ground cable attached to the top of the heat exchanger mounting plate. Also, I had not disconnected the Raw Water discharge hose attached to the Oberdorfer pump.  They were quickly removed.

Now, lifting the engine an inch or so higher, it swung forward clearing the support stingers, this was working out a lot easier than I had imagined.

I had removed the rug from the deck in front of the galley to the Head door but Peggy said to put it back, we'll replace it and it would be better to protect the floor.

Now that the engine was vertically clear of the engine mounts,  I used a heavy hammer to move the support beam forwards thus moving the engine much further forwards.

We had put some puppy pads between the stringers to catch any drips from the open hoses.

With the engine basically out of the 'Engine Bay' I felt a lot better about the process.

Before lowering the engine, we put a square throwable cushion on the rug beneath the engine and lowered the engine so that it sat on the cushion. 

Despite the smile on my face, I was amazed at how grotty the back of the engine appeared. The gear box looks as though it is covered in a thick grime. In fact it was so thick that the white labels indicating the gear lever movements and the type of gear box oil were not even visible - I didn't know they were there until I sprayed the gearbox with detergent and wiped the surface off.

I'm guessing that the spray from the failing PSS late last year was the cause for the grot on the back of the engine and probably the corrosion on the heat exchanger plate.

At this point the engine is out and supported by a 3 line attachment to the chain hoist, It's sitting on the Red cushion but the bell housing nuts and bolts are not removed.

I first slackened the bolts with a manual wrench. Then we cut out a piece of cardboard and made 10 holes in it to hold the bolts. I used the new cordless socket wrench to remove the bolts and nuts from the housing.

As I removed the Bolts we put them into the cardboard and marked the board with the clock position as well as indicating anything special. ie. Some of the bolts screwed into the housing, others were nuts & bolts (N) and other were removed from the front edge of the housing (R) while all of the others were removed from the gearbox side of the housing.

The nuts were put into a separate container.

Once the bolts were removed, the bell housing is still held in place, there is a 'Pin' on the back of the engine that engages with a hole in the bell housing.

The housing is lose but need to be wobbled off of that pin.

I'm guessing the bell housing and gearbox weigh about 15lbs. It was easy to wiggle the housing off of that pin and lower the housing to the cardboard covered floor.

At last! first sight of the Damper Plate.

It's held on by 8 allen key bolts and came off in just a few minutes.

As soon as it was off we could get a close look at it's condition.

There was very little damage to the plate however, the springs do rattle around in there holders and the edges of the spring holders were showing ware.

Shaking the damper plate we could clearly hear the springs rattling and my understanding is that there should be no movement of the springs within the plate.

Ok, time to clean up and get the replacement.

I had reached out to TMI in Fort Lauderdale whom had confirmed they probably had the replacement plate in stock.  So, let's head down there.

We needed to lockup the boat. The engine was sitting on the cushion and was pretty stable but I wanted to remove the chain hoist. Lowing the engine so that the weight was off the hoist, I was able to lean the engine onto the side of the engine bay portside bulkhead.  Then I could remove the hoist.

We put all of the tools away, locked up the boat and headed to TMI.

Once we found TMI, GPS was not a big help but a phone call to them was answered by clear spoken lady and she gave us directions.

In the store they quickly found the new plate, it's identical and does not rattle!!!

With the new plate in hand and my credit card $133.75 lighter, we headed home to clean up.

Today was a good day! 

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