Rubber cylindrical seals?

[RalphyD]

I am replacing an engine on my 1998 Starcraft Islander 2001. I was very careful to mark and photo everything as I disassembled the engine, EXCEPT, for the two cylindrical rubber thingies on the the bottom rear of the engine. I pulled these things off of the old block and I have an idea where they go on the new block, but do not know the proper orientation of them. They are a softer rubber about two inches long with a head on them and about 1” in diameter. Any help?

 

[Bondo]

Ayuh,...... Welcome Aboard,........ That's not ringin' a bell,....... Got a picture,..??

 

[Alumarine]

Is this an I/O or an outboard motor?
What make and model of motor?

 

[achris]

From your other post I found out what your engine is. Please ensure you list what you are working on every time you start a new thread.

On your new 4.3, are you referring to the rear engine mounts that were in the flywheel cover? If so, what was the old engine? Did a couple of aluminium spacer rings also come out?

If I'm right about what you are talking about, this drawing should help.

Chris.....

 

[RalphyD]

I will post a photo later today. Thanks for getting back

 

[RalphyD]

I would like to add to my previous post. I bought this 1998 Starcraft Islander 2001 from a guy who had replaced the original 4.3 engine with a car 4.3L car engine, but never finished the installation. I brought the boat home and pulled this old car engine and ordered a brand new GM 4.3L marine engine long block. The previous owner was in the process of installing most marine components from the original engine to the automobile engine. I am in the process of installing as many new marine components which I ordered online. I ordered a marine alternator, carb and intake, and lots of other components. A question I have is: “Are the flywheels the same on a car engine as a marine engine”? Is there a weight difference, and if so, what does the marine flywheel weigh? I cannot find any info on this at all. I have downloaded as much info as possible on this boat and engine. I have the mercruiser #25 service manual which has been a tremendous help, but there are a few unanswered questions. I want this installation to be as perfect as I can do. I am very mechanically inclined. When I am done, I want this be as good a new boat and trailer as I can get. The entire trailer brake system has been replaced from the actuator, brake lines, backing plates, lining, bearings and seals. The gimbal and sterndrive are removed and gone over. But there are a few grey areas for me that I have. Will post these as I come across them.
thanks for your help.

 

[Scott Danforth]

the block, heads, and rotating assembly are the same no mater what the motor went into

a marine applications has a marine specific cam, marine specific head gaskets and brass or stainless core plugs

the accessories on the long block are what make is specific to a marinizer.

the flywheel must match the motor generation

no such thing as a marine flywheel. there is a manual transmission flywheel used in industrial applications, marine applications, truck applications, and car applications.

there are 6 different generations and each has 2 variations of 4.3 flywheels

• there is the 1985 only 2-piece RMS, available in both 153 tooth and 168 tooth configurations. this is a one-year wonder
• there is the 1986 - 1987 flywheel available in both 153 tooth and 168 tooth configurations.
• there is the 1988-1991 flywheel available in both 153 tooth and 168 tooth configurations. minor changes from the 1986-1987 motor, however you can interchange them.
• there is the 1992-1995 flywheel available in both 153 tooth and 168 tooth configurations. these changes are due to the balance shaft.
• there is the 1996-2006 flywheel available in both 153 tooth and 168 tooth configurations. Minor changes, specific to machining, etc.
• then there is the 2007 and later (can also use the 1996-2006 flywheel)

so what vintage engine do you have, what vintage flywheel.

 

[RalphyD]

The engine I just purchased is brand new marine 4.3 engine from the GM plant through Eagle Engines. Not sure of the flywheel. Must go to garage and see. I must also contact the previous owner to see what he actually swapped from the original engine to the one he tried to install. I still have the old block that I removed from this boat (the car engine), so I will check the serial number to see exactly what year it is. I don’t know if he swapped flywheels or not.

 

[RalphyD]

My new engine is a1998 configuration. One other question. The new motor came with a crank sensor. Tme old engine did not have a crank sensor. The wiring harness in the boat is not set up for the sensor, do I just ignore the sensor and cap the hole it goes in?

 

[Bt Doctur]

need the hole plugged with something, the sensor or the plug otherwise its a big oil leak

 

[Bondo]

My new engine is a1998 configuration. One other question. The new motor came with a crank sensor. Tme old engine did not have a crank sensor. The wiring harness in the boat is not set up for the sensor, do I just ignore the sensor and cap the hole it goes in?

Ayuh,...... That's answered in yer other thread,......

 

[RalphyD]

I apologize for any unnecessary postings or overposting. I am new to this forum site and am having a little trouble navigating it.
I had asked anybody before about some rubber things on my engine block, but I posted no pics.. I will do so now, but first, let me update. My boat is a1998 Starcraft Islander 2001, 4.3L Alpha one, gen2. The previous owner pulled the original engine and was in the process of installing another one which he got from an auto junkyard. He never finished the Install. I purchased this boat for a very good price. I purchased a brand new marine engine and am in the process installing it. When I was stripping the old engine of the flywheel, I noticed these things on the bottom rear of the block. I pulled them off and put them with the rest of my parts. A month later I am ready to install the marine parts on my new engine. I cannot find these things in any mercruiser manual. My question is: “Are these things specific to cars only? Are they an actual part of my engine? What are they and what is their function? Again, Thanks for any info.

 

[GA_Boater]

I know what they look like , but when you say on the bottom rear of the block, were they in the flywheel cover or in the block itself? How far along was the PO with the old motor install?
Other than what they look like , they could be grommets for locating pins on a bellhousing since the motor is from an auto or truck.

Do you still have the old motor and can show us where the little were.

 

[achris]

I have no idea what they are, but I do know what they are not. They are not part of any marine engine set up I have seen. Therefore, bin 'em. Not used on a marine engine.

Chris......

 

[zellerj]

Do they belong on the engine cover to prevent rattles? A seat?

 

[Bt Doctur]

Agree with chris, have never seen those thing in a marine application

 

[scoflaw]

My engine has them and they go on the plastic flywheel cover. There is a threaded nut inside the rubber and it mushrooms the rubber to hold the plastic cover on.

 

[Scott Danforth]

they do look like speed nuts now that you mentioned it.... however I thing GA is right about what they first look like

 

[RalphyD]

Thanks to all for your input on these little black. I also think they are automotive specific