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Old 07-02-2022, 04:45 PM   #1
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Default Shift/throttle

I have a 1991 2500scr and am having trouble with the shift/throttle, it wonít engage forward or reverse but it will increase the revs, does anyone have any idea please?

Also, I donít think the engine is drawing on water to cool the engine, I have had a battery issue and have replaced 1 battery, could it be the second battery that is causing the issue if itís completely out of charge?

New owner and havenít had one of these before so sorry for stupid questions!

Thanks,
Paul
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Old 07-02-2022, 11:30 PM   #2
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Paul you issues donít have anything to do with the batteries. Is the boat in the water or are you testing it on a trailer. Why donít you think itís drawing in water? Overheating, no water coming out the exhaust,...? On the throttle control is the center button not depressed. Back on the starboard side of the engine you will find the shift bracket where the upper cable from the control terminates and the lower shift cable to the drive is connected. Try removing the lower cable and shift it manually by pushing in and pulling out to see if forward and reverse engage. Can you post some pictures of the control and shift bracket? What engine and drive do you have? Manuals for both can be found under Documents.
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Old 07-03-2022, 07:06 AM   #3
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Thanks for the reply,

Me water is circulating around the engine so itís overheating.

Iím told itís a 5ltr vivo penta engine, Iíll get some pictures and post them so you can see the set up,

Thanks
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Old 07-03-2022, 07:07 AM   #4
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Not the best picture!
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Old 07-03-2022, 11:20 AM   #5
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Maxim only used Mercruiser and I can confirm it is as I see the Mercruiser Thunderbolt IV module on the port riser. Not sure if it’s a 5.0 or 5.7 as they look the same.

You didn’t tell me if you are testing it in the water or on land. If land are you supplying water with a hose and muffs to the outdrive? Also do you have a Alpha or Bravo drive?
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Old 07-03-2022, 12:51 PM   #6
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Sorry, it’s in the water and all the inlet valves are open.

It’s a 5.0 engine, I’m not sure of the make of the throttle, The handle is quite worn and I can’t see a makers name anywhere.

Sorry I don’t understand the Alpha/Bravo question.
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Old 07-03-2022, 01:57 PM   #7
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First picture is in neutral, second picture is in forward and third picture is in reverse but gears not engaging.

Also a picture of the shifter.
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Old 07-03-2022, 04:58 PM   #8
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Find the water hose at the inner transom plate and follow it. It will either go to a raw water pump on the lower starboard side of the engine or directly to the power steering cooler then the thermostat housing. Where it attaches to the thermostat housing try removing it and start the engine to see if water is flowing. No flow the impeller is shot. Regarding the shifting try disconnecting the end of the black cable in your picture. Start the engine and keep it at idle rpm. Now pull on the end of the disconnected cable, does it go into gear? Then try pushing it in all the way, got forward? The control is the US Marine design which is one of the cheapest controls made.
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Old 07-03-2022, 05:14 PM   #9
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Thanks, Iíll give that a try tomorrow 👍🏻
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Old 07-03-2022, 05:15 PM   #10
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Can I just change the control or do I need to replace everything?
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Old 07-03-2022, 05:29 PM   #11
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Quote:
Originally Posted by Kpaul View Post
Can I just change the control or do I need to replace everything?
I donít know if the existing cables will work on the new control. I recommend either a Quicksilver or Teleflex replacement.
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Old 07-03-2022, 05:31 PM   #12
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A picture of the front of the engine would also be helpful. Basically I’m looking to see if you have a raw pump on the lower starboard side that driven by a belt. If so you have a Bravo drive if not it’s an Alpha. Under Documents of this site you will find the Mercruiser manuals for your engine and drive.
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Old 07-03-2022, 09:44 PM   #13
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Quote:
Originally Posted by mmwjr View Post
Maxim only used Mercruiser and I can confirm it is as I see the Mercruiser Thunderbolt IV module on the port riser. Not sure if itís a 5.0 or 5.7 as they look the same.

You didnít tell me if you are testing it in the water or on land. If land are you supplying water with a hose and muffs to the outdrive? Also do you have a Alpha or Bravo drive?
Mike it looks to me that it is a A1, can not see belt driven water pump in photo.
Definitely is an older model as it has older style valve covers.
Don
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Old 07-04-2022, 01:02 AM   #14
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Quote:
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Mike it looks to me that it is a A1, can not see belt driven water pump in photo.
Definitely is an older model as it has older style valve covers.
Don
I suspect so to Don but B2ís were available then on this size boat and a clearer picture will confirm.
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Old 07-04-2022, 07:16 AM   #15
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Thanks guys, I will take some better pictures today.

I appreciate all the help.

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Old 07-06-2022, 10:05 AM   #16
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Does this show you what you need to see re the front of the engine?
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Old 07-06-2022, 10:09 AM   #17
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Picture of front of engine
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Old 07-06-2022, 04:18 PM   #18
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Quote:
Originally Posted by Kpaul View Post
Does this show you what you need to see re the front of the engine?
Yes no raw water pump on the left side so your outdrive is an Alpha.
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Old 07-06-2022, 04:20 PM   #19
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Quote:
Originally Posted by Kpaul View Post
Picture of front of engine
Try removing the hose on the right that is coming off at an angle to see if water comes out when the engine is running.
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Old 07-06-2022, 05:05 PM   #20
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The one I have circled?
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