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Old 06-04-2019, 18:30   #1
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Perkins 4.236 - Velvet drive (71C 2.11:1) questions

There is more oil in the bilge that I like and I'm not quite sure from where it is coming. Likely it is coming from both the engine and the transmission.

I've got the velvet drive off and will be getting it rebuilt. It appears to have an oil leak. Or rather is has atf on it and is seriously oily and rusty. Go figure.

Inside the engine's bell housing appears to be mostly oil free. There is a little in the drain hole but it actually looks quite "clean" on the damper plate and inner housing.

I had assumed that I would be taking the ball housing off, replacing the damper plate and replacing the rear main seal. But if the main seal is not leaking I may not mess with it.

I've removed all the bolts that hold the bell housing in place, removed the started but left the studs in and the bell housing does not budge. It looks like that there are 2 locater pins as well.

Before I go all BFI (brute force and ignorance) on it is there a "trick to removing the 4.236 bell housing? I guess this is the question!

With the transmission out I have better access to clean the bilge. After it is clean I'll fab up a drip pan to go under the engine to try to keep any oil out of the bilge.
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Old 07-04-2019, 10:40   #2
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Re: Perkins 4.236 - Velvet drive (71C 2.11:1) questions

So far from some research it appears that there is no hidden bolt and that the dowel pins are what is holding the bell housing on.

I'll be on the boat later today and use a bit more force.

Another question: Does anyone have a recommendation of a shop to rebuild a Velvet Drive between Portland and Bellingham?

At the moment I am thinking about Harbor Marine in Everett. Anyone know them?

Regards!
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Old 07-04-2019, 11:03   #3
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Re: Perkins 4.236 - Velvet drive (71C 2.11:1) questions

Where is the leak on the trans? If is leaking at the splines it just needs some RTV sealant and a new nut
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Old 07-04-2019, 19:01   #4
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Re: Perkins 4.236 - Velvet drive (71C 2.11:1) questions

The whole transmission is filthy - rust, oil and who knows what else. That is part of the reason that I had planned on rebuilding it. Sending it off to a shop is as much my being lazy as wanting the shop to clean it and paint it.

It is hard to tell where the oil is coming from. See the photo below to get an idea of how it looks.

It does shift fine And if I knew that there would be no problems for the next 5 years I would be tempted to let things lie where they are.

I do have a full rebuild gasket/disc kit so now that it is out...
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Old 07-04-2019, 19:08   #5
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Re: Perkins 4.236 - Velvet drive (71C 2.11:1) questions

I did get the ball housing off. The primary cause for it not coming right off was the sealant used on the gasket. That and the single locating dowel was tight. I ended up getting a 2 x 4 and playing Atlas to break the seal.

Wow, that flywheel is massive. Mostly I've built Fiat Spider 124 engines (1.8 l and 2 l) to Guy Croft fast road specs. The flywheel is tiny in comparison.

No rust on the flywheel, almost no oil on the bell housing. I think that we can say that the rear seal if good.

This photo shows the inside of the bell housing. The drain hole is on the right.
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Old 07-04-2019, 19:15   #6
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Re: Perkins 4.236 - Velvet drive (71C 2.11:1) questions

One last photo. This is the flywheel - I got some water on it so I've wipled it down with Boeshield to keep it nice looking. This is more or less how it looked when pulling off the bell housing.

With the transmission off I will have room to move the bilge pumps around, replace their hose and fit a drip pan under the engine.
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Old 12-04-2019, 20:28   #7
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Re: Perkins 4.236 - Velvet drive (71C 2.11:1) questions

My recommendation is Harbor Marine. Let us know how it goes. I have a sailing buddy with a Perkins 107 and Velvet V drive thatís weepy
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Old 12-04-2019, 20:29   #8
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Re: Perkins 4.236 - Velvet drive (71C 2.11:1) questions

Is this in a Cal also??
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Old 12-04-2019, 20:34   #9
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Re: Perkins 4.236 - Velvet drive (71C 2.11:1) questions

The transmission is up at Harbor Marine. Let you know how it goes after the rebuild and after a few hours running.

It is from a Gulfstar.
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Old 13-04-2019, 17:24   #10
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Re: Perkins 4.236 - Velvet drive (71C 2.11:1) questions

I picked up a set of replacement nuts and bolts for mounting the bell housing and transmission. Most grade 8.

I am having trouble sourcing the transmission mounting studs. There are 6 studs sized 7/16-20 3-5/8" long. They are tap end studs and all mu google searches comes up with nothing. Of course I'll keep looking but If you know of a source please share it with me.

The original studs and nuts are quite rusty and pitted. Worst case I'll reuse them till I find a replacement.

Only about 2 weeks till I get the transmission back.
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Old 12-05-2019, 10:37   #11
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Re: Perkins 4.236 - Velvet drive (71C 2.11:1) questions

Never did find studs of the right length so I used cap screws. A bit overkill I suppose but easy to source. I used 2 of the old studs for alignment then removed them.

Had new hoses built and replaced the oil cooler. The replacement has a zinc and the old one is now a spare.

Had to replace the input shaft. That ugly rust on the transmission has eaten away into the shaft and through the seal. Looks like it was sprayed with hot acid. Wonder what caused it.

I did not do the rear oil seal on the engine. There was no oil in the bell housing and I went back and forth and if it ain't broke don't fix it won.

Here is what it looks like now.
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