3607 transmission type

1000 islands · Feb 8, 2014

I have a 1989 Carver 3607 with 8.2L Blue water Mercruisers and I'm wondering about the type of transmission it would have.

I'm not too familiar with the different inboard transmissions, so I'm assuming it's a "V" drive....what ever that is...lol

At some point in the discussion when I purchased it I think I heard the broker say it was a direct drive.

Any help and information about the drive would help me in understanding what maintenance it would require.

Capt Ralph · Feb 8, 2014

I'm not a Carver know-it-all, but I know by sight what a clutch/gear/model is. If you could submit a few pictures, A few of us can respond smarter. May be able to give a SWAG at the reduction also.
With little you have offered (Not a Carver guru), LBC (502cid) would use Borg VD 72Cs near 2:1. Or if V drives; Borg 5000 drives. Send some pics and see how for off I am. I don't think ZF was into LBCs.
This would be a wonderful time to find some owners manuals with this info also. Not only would you know what you have, you would know how to service and check it.
Did you have a survey done?? Should be reported in that at least.

I can't type nicely about brokers. I'll let somebody else respond about your brokers comment.
,rc

Wife made me attach this;
LBC - Large Block Chevy
502cid - 8.2 Liter Gas engine
VD - Velvet drive
Borg - Borg Warner Corp
ZF - ZF Gear Corp

She is also glad I did not comment about brokers.

RT46 · Feb 9, 2014

I bet the info is on your survey, or it should be.

I am not a Carver guy, but I have seen that Vdrives are common in Carvers.

The V Drive gives you more cabin space by placing the engine further back in the boat.

Its easy to see if you have Vdrives by looking at your engines;
Are the belts towards the bow or towards the stern?
With a V drive the engine is "backwards" in the boat and the belts are towards the stern. With the V drive there is a gear after the transmission that redirects the shaft under the engine out the back of the boat.

Im not sure how often you have to check V drives but the do have a maint schedule and have gear oil in them that needs to be checked,

I think the 502s are standard rotation engines and don't use the BW 72c series. The 72c were common behind counter rotating 454s.

Something close to a 2:1 sounds about right for your size boat with that power

Capt Ralph · Feb 9, 2014

RT46
You may have a point on CR 502s. I don't recall ever noticing a CR502. They may be out there but not sure off the top of my head.
Now my interest is up. Now I would like to know what clutches are in there.
Back to da web...

Capt Ralph · Feb 9, 2014

Found some pictures on da web. seems the 3607 is an aft cabin. Straight inboards. Mains under the saloon sole. The only pics I found was with SBCs but not of the clutch and no clutch info in any listings.

The Merc web page talks about ZF electric clutches on the new 8.2s.

1000 islands · Feb 9, 2014

I don't have any pics and the survey is on the boat covered with shrinkwrap.

The engines are facing forward, belts towards the bow.

The broker told me they were direct drives, but......he's a broker.

Capt Ralph · Feb 9, 2014

Contact your surveyor, he can e-mail you a copy.

With the ships serial number, You can contact the factory and see if any information is still available. ANY is better than none.

Your survey should also contain model numbers of your microwave, tv, stereo, ice-maker, inverter, gen-set, battery charger, water pumps, thrusters, dink & motor, batteries, Steering system, Windlass, electronic & Nav equipment, Yada Ada.

Including your engine and clutch info.
Hunt up all the mfgs on the web and down load the manuals.

You can get a lot of fine reading done before your ship thaws out. You can be ready for those checks and check-outs on the first warm day and know much more about your ship and how to service it.

Have fun,
rc

Monepit · Feb 10, 2014

A 3607 would not be a V drive. They are an aft cabin so it is a direct drive. The broker was right.

1000 islands · Feb 10, 2014

So by direct drive, does that mean there are no reduction gears and the props spin the same rpm as the engine?

RB480 · Feb 10, 2014

A V drive has the engines facing aft, the V drive is like a transfer case that allows the engine to be mounted aft (where your aft cabin is). The engine faces aft and the shafts remain in the same place, hence the V configuration.

For what it's worth, my 370 has Borg Warner velvet drives 2.57:1

K1W1 · Feb 10, 2014

1000 islands said: ↑

So by direct drive, does that mean there are no reduction gears and the props spin the same rpm as the engine?
Click to expand...

Hi,

In this case as I doubt it.

RT46 · Feb 10, 2014

I would bet you have a reduction close to 2:1 or more, like 2.5:1

I cant imagine a pair of 502s w 1:1s, spinning props at 4400rmps on a 36 foot boat that i bet weighs close to 20,000 lbs.

there are prop and gear calculators online that can get you really close to what you have

Capt Ralph · Feb 10, 2014

Lets get a copy of that survey in the owners hand. I think we all have figured out it a straight drive system. I'm interested if they used Borg or ZF.
We all know it's not a direct drive (no reduction) but were dealing with an unknown broker. He may have meant straight drive but used the wrong lingo.
Once we figure what is really there, service advice guesses are reduced greatly.

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3607 transmission type

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