Omc 400 (nervous now)

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Mar 4, 2009
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i am brand new to boating. bought my first boat aprox. 2 months ago. it is a 1978 mark twain bowrider. it has the omc 140 engine and an omc 400 outdrive. i was wondering how dependable the outdrives are and if they are hard to maintain. thanks in advance for any and all info.

just looked at the front of the manual. it says stern drive not out drive. are they the same thing?
 
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danond

Lieutenant Junior Grade
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Jun 11, 2007
Messages
1,118
Re: Omc 400

Re: Omc 400

No joke, you've just purchased one of the most difficult to maintain drive systems out there. It's called a "stringer" drive.

The manufacturer (OMC) has been out of business for a long time and many parts are no longer available. If you really love the boat, you should go talk to your local marinas and see who will fix it for you, and if nobody will, get all the manuals you can find for it and start learning.
 
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Re: Omc 400

Re: Omc 400

man that sucks. however the boat did come with a very detailed, 468 page OMC manual. i'm not worried about having someone work on it. i can do that myself. i have 17 yrs experience in auto, atv, and dirtbike mechanics. so i believe i can work on it. the parts availability is what worries me now. i do appreciate that bit of info. i will be reading up on the stringer drive systems. i said that it was an omc outdrive, the manual says omc STERN DRIVE, are they the same thing? thanks
 
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Joined
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Messages
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Re: Omc 400 (nervous now)

oh man, now i'm all nervous and stuff. just my luck that my first boat would a difficult one. lol
 

Fishermark

Vice Admiral
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Messages
5,617
Re: Omc 400 (nervous now)

Stern drive - outdrive - same thing.

You're right to be nervous.... but not panicked. ;)

Since you can work on things yourself you will be better off than someone who cannot. Having said that, most outdrive require some specialized tools which can get expensive if you plan on doing ALL the work yourself. Ask specific questions as you go along and someone here will help.
 
Joined
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Re: Omc 400 (nervous now)

ok thanks. hopefully when i get it on the water there will be nothing wrong with it. hopefully it will last a while before i have to work on it.
 

Rocky_Road

Lieutenant Commander
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1,798
Re: Omc 400 (nervous now)

oh man, now i'm all nervous and stuff. just my luck that my first boat would a difficult one. lol

Don't knock yourself out for buying an 'orphaned' setup, first time out! Happened to me...and, if I had to guess, to many of us here. Part of the learning curve....

As for OMC parts, there is an eBay seller that I have had great dealings with, and seems to be able to find those elusive parts. Here is a link to his profile...you might want to bookmark it, and try him when the need arises:

http://myworld.ebay.com/sharkattack52/
 

WizeOne

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Mar 23, 2008
Messages
2,097
Re: Omc 400 (nervous now)

hillbillyrider, no need to be nervous. It is good that you have the OMC manual. Take care of the drive and you'll come to appreciate it. True they are out of business and it is getting harder to find competent mechanics but you will soon learn that the other options are not all that hot either.

Your Hydro-Mechanical shift stringer is a whole lot less compex and requires a whole lot less routine maintanance than the black anchors. You don't have all the Rube Goldberg pumps, plumbing and boots, U-joints, gimbals, gimbal bearings, cables and alignment requirements that they do.

Additionally, your stringer turns tighter and lifts out of the water higher and quicker. You can also sit on the transom and and pull a ski rope out of the prop or change a propeller. You'd be diving in if you had a black anchor and dropping pins, washers, nuts and wrenches into the deep blue sea.

Some points of care and observation for your drive is the tilt motor, the waterpump shaft and the ball gears. Never run with the outdrive in an up position, never hit the tilt toggle and hold it down until the drive goes clunk. Once you've learned it's downward speed, let off the toggle and bump it the rest of the down the rest of the way, otherwise you can spit the wormdrive gear right out into the briney deep.

As I mentioned earlier, the impeller is not an annual event. Keep the fluid changed and checked and do not use a stainless steel propeller.

I would look around your area and see if you can find a good OMC mechanic before you might need one. If push comes to shove, you can always ship the drive to Portland Oregon where there is a preeminent OMC guru. He gets drives shipped from all over the country including Alaska and Hawaii.
 

Ridemywideglide

Petty Officer 2nd Class
Joined
Jan 13, 2009
Messages
166
Re: Omc 400 (nervous now)

hillbillyrider, no need to be nervous. It is good that you have the OMC manual. Take care of the drive and you'll come to appreciate it. True they are out of business and it is getting harder to find competent mechanics but you will soon learn that the other options are not all that hot either.

Your Hydro-Mechanical shift stringer is a whole lot less compex and requires a whole lot less routine maintanance than the black anchors. You don't have all the Rube Goldberg plumbing and boots and gimbals, gimal bearings and cables and alignment requirements that they do.

Additionally, your stringer turns tighter and lifts out of the water higher and quicker.

Some points of care and observation for your drive is the tilt motor, the waterpump shaft and the ball gears. Never runn with the outdrive in an up position, never hit the tilt toggle and hold it down until the drive goes clunk. Once you've learned it's downward speed, let off the toggle and bump it the rest of the down the rest of the way, otherwise you can spit the wormdrive gear right out into the briney deep.

As I mentioned earlier, the impeller is not an annual event. Keep the fluid changed and checked and do not use a stainless steel propeller.

I would look around your area and see if you can find a good OMC mechanic before you might need one. If push comes to shove, you can always ship the drive to Portland Oregon where there is a preeminent OMC guru. He gets drives shipped from all over the country including Alaska and Hawaii.

Small hijack... I've got an 800, but I think the questions still apply.
Toggling the tilt; it DOES move very fast and I've had it bang down once or twice already. Is there a way to slow it down? Maybe a different motor with higher torque/lower rpm? I think that taking away voltage would just result in a stall.
And, Why no on using a stainless prop?
 

WizeOne

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Mar 23, 2008
Messages
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Re: Omc 400 (nervous now)

Just one of those little idiosyncracies that you need to learn to deal with Ridemywideglide. For me it has become second nature. The biggest issue would be if you loan it to someone.

As far as the prop, stainless is harder on any earlier drive because it is both heavier and it does not give well if it hits something. As well, the OMC does not use a rubber coupler at the flywheel, it is solid steel, so you have a lot more vibration in the drive train during idle, accel and decel that a heavier prop exacerbates. Your OMC is getting long in the tooth and anything you can reasonably do to keep it running, is good. Believe me, any little bit of advantage that you might get with SS will be soon lost if your prop hits something.(not to mention the cost of repairing a SS prop)
 

Ridemywideglide

Petty Officer 2nd Class
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Jan 13, 2009
Messages
166
Re: Omc 400 (nervous now)

Thanks for the info.. I wasn't looking at getting a new prop, just didn't know the reasons behind it.
At this point, I just want it to start whenever I hit the key, and get me back to the dock when I'm ready to leave.. :D
 

WizeOne

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Mar 23, 2008
Messages
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Re: Omc 400 (nervous now)

Thanks for the info.. I wasn't looking at getting a new prop, just didn't know the reasons behind it.
At this point, I just want it to start whenever I hit the key, and get me back to the dock when I'm ready to leave.. :D

Did you install that mechanical shift 800 in that old scow? If so, was it complete or did you use the electric shift intermediate housing?
 

Ridemywideglide

Petty Officer 2nd Class
Joined
Jan 13, 2009
Messages
166
Re: Omc 400 (nervous now)

I paid a man $500, and towed home a boat.... :D


I'll have to get pictures of the stuff in the engine bay so I can answer that question correctly, but I think it's all mehcanical...
 

THE BEEF

Chief Petty Officer
Joined
Jun 11, 2005
Messages
432
Re: Omc 400 (nervous now)

When lowering that 800 just bump the switch a couple of times thats all it takes you will hear it stop.
Bring it up just keep the switch up untill you hear it stop going up.
As far as nervous now , take a deep breath,it will be ok.
Just keep up on maint.
Beef
 
Joined
Mar 4, 2009
Messages
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Re: Omc 400 (nervous now)

thanks for all the replies. i feel a bit better now. hopefully i can learn the ropes pretty quick and take good care of it. and maybe, just maybe it will last a couple of seasons before it gives me any trouble. thanks again fellow boaters.
 

WizeOne

Commander
Joined
Mar 23, 2008
Messages
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Re: Omc 400 (nervous now)

I paid a man $500, and towed home a boat.... :D


I'll have to get pictures of the stuff in the engine bay so I can answer that question correctly, but I think it's all mehcanical...

Look on the outside of where the shift cable comes out of the intermediate housing. If there is a little bracket with a bolt head that holds the cable in place, then it was a complete swap, ie, '85 O/D and intermediate housing. If there is no clamp bracket then chances are that they enlarged the passage where the old electric shift cable went thru and then gooped up the passage to seal for water intrusion.

It's not a huge deal. I did an OD swap on my '75 'lectric shift, back in late '79 and I kept the original electric shift intermediate housing. One significant difference is the main drive shaft and coupler. The electric shift shaft and coupler had smaller splines that were prone to wear. Sometime after '78 they went to beefier splines. Mine has since been updated. After 30+ years the splines on mine were significantly deteriorated.

Another way you can tell is if you can find a drain plug for the intermediate gear case (on the rear face of the IH) The earlier ones did not have one.

It is just good for you to know which one you have.
 

Ridemywideglide

Petty Officer 2nd Class
Joined
Jan 13, 2009
Messages
166
Re: Omc 400 (nervous now)

thanks for all the replies. i feel a bit better now. hopefully i can learn the ropes pretty quick and take good care of it. and maybe, just maybe it will last a couple of seasons before it gives me any trouble. thanks again fellow boaters.

It appears we're in the same boat, no pun intended.. :)
First boat, price was right, just want to go fish and teach the kids some wakeboarding for now. This boats old, the stringers are soaked, and someone painted the whole damn boat with what looks to be house paint, using a roller no less... It's not a keeper, it's a stepping stone. I'll upgrade after I learn the ropes.

Look on the outside of where the shift cable comes out of the intermediate housing. If there is a little bracket with a bolt head that holds the cable in place, then it was a complete swap, ie, '85 O/D and intermediate housing. If there is no clamp bracket then chances are that they enlarged the passage where the old electric shift cable went thru and then gooped up the passage to seal for water intrusion.

It's not a huge deal. I did an OD swap on my '75 'lectric shift, back in late '79 and I kept the original electric shift intermediate housing. One significant difference is the main drive shaft and coupler. The electric shift shaft and coupler had smaller splines that were prone to wear. Sometime after '78 they went to beefier splines. Mine has since been updated. After 30+ years the splines on mine were significantly deteriorated.

Another way you can tell is if you can find a drain plug for the intermediate gear case (on the rear face of the IH) The earlier ones did not have one.

It is just good for you to know which one you have.

I'll dig in there this week hopefully and see what I can see. We've had some blizzard weather here the last few days so I had to drain it all down and cover it up once again. Gotta love springtime in the Rockies...
To this point I've just been working out the bugs from age and sitting. After a carb rebuild it seems to run very well, But I think I have an issue with the fuel pickup still.. That'll be another thread I the weather cooperates.
 
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