1960 Merc 200 22HP "slipping" at higher RPM

[lfthzmrk]

I have a technical question regarding a symptom I am observing. I have what appears to be motor/transmission/drive train slipping at high RPM. I have replaced the prop and the motor still "slips" at higher RPMs usually after running for a few minutes at 3/4 to full throttle. It seems to be further aggravated the warmer the motor gets. I have not struck any objects or heavily fouled the motor at any point so I am stymied by what is causing the problem. Any thoughts???

 

[Bondo]

Re: 1960 Merc 200 22HP "slipping" at higher RPM

I have a technical question regarding a symptom I am observing. I have what appears to be motor/transmission/drive train slipping at high RPM. I have replaced the prop and the motor still "slips" at higher RPMs usually after running for a few minutes at 3/4 to full throttle. It seems to be further aggravated the warmer the motor gets. I have not struck any objects or heavily fouled the motor at any point so I am stymied by what is causing the problem. Any thoughts???

Ayuh,.... Welcome Aboard,... Could ya define, 'n expand on the "Slippin' "..??

Does it go outa gear,..?? for how long,..?? what's it take to re-engage it,..??

 

[lfthzmrk]

Re: 1960 Merc 200 22HP "slipping" at higher RPM

Ayuh,.... Welcome Aboard,... Could ya define, 'n expand on the "Slippin' "..??

Does it go outa gear,..?? for how long,..?? what's it take to re-engage it,..??

First off, thanks for replying!

I am not sure if it actually goes out of gear. Here is a play by play.

Start motor, allow old motor to warm while I untie boat and get comfy :joyous: begin enjoying drive across I-bay. after escaping the no wake zone (2-3 minutes) accelerate smoothly to 3/4 throttle. Run at speed for 4 or 5 minutes and then suddenly out of nowhere the motor winds out like I sheared the prop pin in my old eska. I back off the throttle to idle speed (sometimes I go all the way into nuetral and sometimes I did not, I did not really track that closely) and then I can start to run it back up to speed. Now that it has slipped for the first time, it will continue to do it when I get to 3/4 or full throttle. It may or may not occur again right away, but it usually does not take long (less than 1 minute). I can usually maintain 1/2 throttle without inflicting the angry tantrum from the old girl. As I said previously I have replaced the prop with a "brand New" 50 year old still in the box prop (what a find!). So I thought I had it licked, then I took it out the other day and more of the same :blue:

It might be going out of gear, that is sure what it feels like. Total loss of forward power, boat suddenly coasts while the motor winds up like it is about to take off.

If it is popping out of gear what should I be looking for?

 

[Maxz695]

Re: 1960 Merc 200 22HP "slipping" at higher RPM

How long have you had the engine on your boat? Have you moved the engine at any time. If te motor is not low enough it will ventilate at high rpms and during turnng. Try to get the engine lower into the water if possible. It also may be worn linkages check for loose connectors and broken sleeves if there. The cam for the lockdown may also be hindering full foward gear.

 

[lfthzmrk]

Re: 1960 Merc 200 22HP "slipping" at higher RPM

How long have you had the engine on your boat? Have you moved the engine at any time. If te motor is not low enough it will ventilate at high rpms and during turnng. Try to get the engine lower into the water if possible.

I have had the boat for two years. It has run well. I did not experience any issues with it last year. In the spring this year it did it a few times and I could not figure it out so I just lived with it since it was not frequent and I could not predict it. In October I took a trip to Black Lake and it was running like a champ and after one long run (45 minutes) across the lake it started doing it. It has been perpetual since. It seems like something got hot but the motor runs fine. It spews plenty of water and always has. I have never experienced performance issues during turning or at full high speed before this problem creeped up. I do not have a firm understanding of the mechanicals of the drive train. I was hoping someone had seen similar from this type motor before and could narrow the search for the adjustment or part to replace.

 

[Barnacle_Bill]

Re: 1960 Merc 200 22HP "slipping" at higher RPM

Have that prop checked. Rubber deteriorates over time so that "brand new" 50 year old prop could have a bad hub.

 

[lfthzmrk]

Re: 1960 Merc 200 22HP "slipping" at higher RPM

Fair enough, how is it "checked"? Is it a process I can do at home? Does it require any special tools?

 

[Bondo]

Re: 1960 Merc 200 22HP "slipping" at higher RPM

Fair enough, how is it "checked"? Is it a process I can do at home? Does it require any special tools?

Ayuh,... Send 1 of 'em, say the old 1, out to have it re-hubbed, 'n Try it....

if it cures the problem, have the new 1 done...

The driveline consists of, the power head, 'n the lower unit...
There's splines at the interface, 'n if they're gone, ya won't go nowhere, ever...

Yer symptoms sure Sounds like the prop's hub is slippin'...

 

[Chinewalker]

Re: 1960 Merc 200 22HP "slipping" at higher RPM

That motor has the oft-maligned Automatic Transmission. It is possible one of the engagement springs is slipping. If you eliminate the propeller as a cause, then the transmission is likely your problem. Then it would be time to find an OEM shop manual and some special tools... or an old-time Merc mechanic willing to work on it.

 

[lfthzmrk]

Re: 1960 Merc 200 22HP "slipping" at higher RPM

That motor has the oft-maligned Automatic Transmission. It is possible one of the engagement springs is slipping. If you eliminate the propeller as a cause, then the transmission is likely your problem. Then it would be time to find an OEM shop manual and some special tools... or an old-time Merc mechanic willing to work on it.

I was afraid it might be that. I will further investigate the prop with the old draw a line and check to see if it is slipping trick. Then I will likely be hunting for an Old Merc mechanic. I suspect I could smell one down by the water if the wind is right.:lol: any references for western NY???


THANK YOU to ALL I really appreciate it!!!

 

[Chinewalker]

Re: 1960 Merc 200 22HP "slipping" at higher RPM

I don't know if they still do, but back when I was in college there was a mech at Bryce Marine in Greece who was knowledgeable about the older Mercs. They used to have some old Mercs in their showroom, too. Might be worth a shot... Especially since winter has socked in and they might not have a whole lot to do...

 

[lfthzmrk]

Re: 1960 Merc 200 22HP "slipping" at higher RPM

I don't know if they still do, but back when I was in college there was a mech at Bryce Marine in Greece who was knowledgeable about the older Mercs. They used to have some old Mercs in their showroom, too. Might be worth a shot... Especially since winter has socked in and they might not have a whole lot to do...

I know the place, I drive by it once or twice a week. Thanks again. I will definitely check it out. BTW I like your motor picture. Do you have an old merc?