technical manuals

sirfinn · Post by **sirfinn** » Wed Apr 20, 2011 9:25 pm

Hi
my name is robert. i have rebuilt the cr 350 engine for my 28' catilina? hull# cchdb6882m82h. Single screw, why its counter rotating is something i would like to know as well?

i would love to find some technical manuals to help with re assembly. I have browsed the archives but cant narrow my search enough to avoid cool sales brochures from a better managed time. these are great but dirty hands and time running out, real data is what will be most helpful.

the boat has a fresh water cooling system, fortunately.
Thanks for any help
Robert

Wood Commander · Post by **Wood Commander** » Thu Apr 21, 2011 6:02 am

As to the "counter rotating", please explain what you mean? Counter rotating is a term usually applied to twin engine boats, meaning that the two props are rotating in opposite directions, usually to the outboard side of each side of the boat.
In a single screw boat, you would usually expect the prop rotation to be to the right.

Is your engine a Mercruiser, or maybe a Chris Craft/Marine Power, or something else?

I have bought literature from a place called "Vintage Marine Literature" or something of that like. I can't recall for sure because it's been a long time since I've dealt with them. But I think the man's name was Nate Hammond, a search of his name might help.

mfine · Post by **mfine** » Thu Apr 21, 2011 6:23 am

http://www.ccmanuals.com/

thompsonboatboy · Post by **thompsonboatboy** » Sat Apr 23, 2011 5:53 am

Nat Hammond sold his marine literature business several years ago. The collection went into hiding.

Andreas

Wilson Wright · Post by **Wilson Wright** » Sun Apr 24, 2011 7:17 am

Into hiding ??? Was it a secret that Todd Warner bought it ?...If it wasn't sold at the auction, he probably still has it. Why not ask him.

Paul P · Post by **Paul P** » Thu Apr 28, 2011 1:10 pm

I think we have a situation of semantics here. The term “counter rotation” is probably being associated with “opposite hand rotation”.

It seems that virtually "all" Chris Craft single screw boats use the RH rotation installation, which in many installations requires the motor to be fitted so it spins opposite hand from the automotive version from which it originated. This gets complicated because CC is notorious for running transmissions off the front of the motor, in order to get the flywheel forward and out of the bilge. Therefore there are TWO designations you must be aware of: the FIRST one is the use of LH and RH or Opposite Hand, and perhaps Counter Rotation, when talking about final direction of the prop spin; and the SECOND one is how the motor itself is affected.

Beware, the latter (how the motor is affected) can be confusing, because you can take a standard automotive (LH) rotation motor, turn it around backwards and hook the transmission to the front of the motor, and you have a RH rotation installation (however, as far as the motor is concerned in the machine shop, it is a LH standard motor).

All the old Hercules motors all seemed to spin a RH prop. These were all flywheel forward for good reason. Had the flywheel been aft, it would have scooped bilge water all over the place, and it would have caused the motor to be raised in the boat, and it would have also been spinning LH. Since the base Hercules industrial motor is spinning in the standard automotive (LH) direction, the result is actually a RH rotation when CC turned it backwards with the flywheel forward for marine use, with the transmission hooked to the front of the motor. It seems just about all motors were spinning in the LH position oddly enough throughout the entire motor manufacturing world. It seems that the ONLY internal combustion motors that actually spin in a RH mode are those modified for marine use, or perhaps those that are turned around backwards. When CC used twin Hercules motors, one of them had to be fitted with a special gear to make it spin opposite hand, so the boat had counter rotating props.

For marine use, when CC started using V8 motors in particular, they installed the standard automotive 283 in runabouts with the flywheel forward. This is a neat installation with the transmission running off the front of the motor, the flywheel being forward won’t scoop bilge water and spray it all over the place, and the motor can be laid way down into the bilge for a nice and safe low center of gravity. Because the motor was installed backwards, the standard automotive LH motor was spinning the standard RH propeller. Then when CC started using twin V8 motors, something had to be done for the counter-rotating motor. This involved using a special gear at the front of the motor to make it spin the opposite rotation, also requiring attention to the pumps, distributor, timing, and camshaft.

Regards,

Paul

Paul P · Post by **Paul P** » Thu Apr 28, 2011 1:14 pm

Since the 350 in the 28 Catalina is a single screw, and the chances are it is turned around backwards with the flywheel forward, it seems to make sense that the motor is an opposite hand motor (another way of saying it is a counter rotation motor), with the special gear, special cam, etc., to make it spin opposite the standard automotive version, to conform with the standard CC practice of always having the final result be a RH prop (ALWAYS when viewed from behind the boat).

This is probably a 350Q series motor.

regards, Paul

mfine · Post by **mfine** » Thu Apr 28, 2011 1:47 pm

In a standard rotation engine the flywheel turn counter clockwise and the cam is chain driven and turns in the same direction. An opposite or reverse rotation engine has a clockwise turning flywheel and uses a gear to turn the cam in the opposite direction.

If the flywheel is forward, the standard rotation engine has the flywheel rotating counter clockwise when viewed from the bow looking back. The prop will turn clockwise when viewed from behind the boat. An opposite or reverse rotation engine will have a clockwise flywheel and counter clockwise prop.

If the flywheel is aft mounted, the standard rotation engine has the flywheel rotating counter clockwise when viewed from the stern looking forward. The prop will turn counter clockwise when viewed from behind the boat. An opposite or reverse rotation engine will have a counter clockwise flywheel and clockwise turning prop.

Paul P · Post by **Paul P** » Thu Apr 28, 2011 3:44 pm

We are in total agreement.

regards,

Paul

sirfinn · Post by **sirfinn** » Mon Jun 20, 2011 12:49 pm

Thanks for all the input! i would have replied earlier, need to set up my email alerts.

Everyone is correct. it is a oposite then auto spinning single 350 engine. flywheel in the bildge connected to paragon tranny. The tranny has a dipstick on the upper left side. it did not look like a dipstck and took me a while how to check the tranny oil. was monkeying around scratch head and started pulling on what looked like a plastic vent cover. there was a dipstick under it.

I think someone replaced the engine and tranny from a double engine boat and installed the cr package?

hooking up the wiring today. cant wait to splash her.

Thanks again

technical manuals

technical manuals

Technical manuals

counter rotation

cr engine

Who is online