help with chrysler 25 please.

[aaronkumlien]

hey everyone, im not new to boating but new to owning my own and repair of the motor. i have done engine work but not outboards but thats not where my problem lies i think. the lower unit is something i know nothing about really. last year i bought a boat with a chrysler 25 on the back which might bad decision? anyway, the motor ran and runs good but the second time i had the boat out i was running at full speed and it just gave way and reved up a bit. put it in neutral and tried to put it in gear and nothing, just reved the motor. i've been doing some reading and its come down to spun hub or coupler? when back at the pier had a couple of guys at the cottage looking at it with me and i noticed while my bud was putting it in gear and we where check out the motor the water was not coming out the exhaust. while we didnt run it long i dont think this was long after i rowed up and docked it so i dont think it was just because it was cold still. i dont want to start it and let it run to see if the water comes out and ruin the engine but dont know where to start. id rather do the fix myself it possible which is why im posting here to see if i can get some info on weather this is something i can do or if i should take it in to someone but id rather not spend the money if i can do the fix myself. thanks, aaron

 

[aaronkumlien]

Re: help with chrysler 25 please.

oh ya, i should mention that this happened last year and boat sat all winter which doesnt really have anything to do with the problem but i went to check it out today and with motor off and in neutral the prop spins easy but when i put the boat into gear the prop still spins. there is some resistance but i can spin it by hand pretty easily so isnt this to say that im not turning the engine when im spinning the prop in gear? shouldnt it be very hard to turn unless i remove the plugs? just thought this might help others help me. thanks, aaron

 

[carholme]

Re: help with chrysler 25 please.

Aaron;

Do you have the model number for the engine or a year of manufacture?

Gerry

 

[aaronkumlien]

Re: help with chrysler 25 please.

hi gerry, the model number is 257h80 and i'm pretty sure the motor is a 1978.

 

[steelespike]

Re: help with chrysler 25 please.

I could swear I posted but here goes.It could be a sheared drive pin.In the prop and shaft Remove the prop and take a look.
If you don't know the condition of the impeller(pump) you should change it.When testing in a barrel water should be up to the mounting bracket

 

[carholme]

Re: help with chrysler 25 please.

Aaron;

Do you think the model could be 257H8C rather than H80? Pretty sure it must and here is a link to the parts:

http://www.crowleymarine.com/mercury-outboard/1756.cfm

Let us know what you find after checking the drive pin. You will see it under Gear Housing as item 8.

Gerry

 

[aaronkumlien]

Re: help with chrysler 25 please.

ok guys, sorry its taken me a bit to post back but i didnt have a lot of free time to start on the boat. i pulled the prop, pin and lower unit off the motor today and this is what i found. the pin in or behind the prop is fine. the shaft that runs into the motor that drives everything in the lower unit is where the problem lies. when i got the lower unit free and pulled it out of the motor, the teeth on the shaft were full of dried grease of something like that. it was easy to clean it out of the groves in the shaft where it connects or seats into the motor. i took some pics which ill post but what i think is that where the shaft goes into the motor, the gear part on the motor must be sheered or ground off. i was able to stick the shaft back in, slide the prop onto its gear shaft and turn the shaft continually. i could feel the clicks or the gearing of the shaft when turning and felt kinda like a stripped nut feeling if you know what i mean. so is this really bad? i didnt want the problem to be up that far but it looks like i dont have a choice. is the engine part of this gear easy or manageable to remove? so i have to remove the engine and flip it over or can the engine gear part of the system be removed for the engine form the top of the engine? thanks for all the help im getting here, i do appreciate it. id still like to do this myself if its something that can be done. ive done many different things and feel like i could do it but someone who knows about this type of thing would help me to decide weather i can do this or should take it in. money is an issue. not really for parts but i assume labor cost would be high taking it to a place to get done.

 

[Frank Acampora]

Re: help with chrysler 25 please.

There is nothing wrong with your drive shaft. First, mark the brass hub and white prop behind as it shows in the third photo. Install it on the engine and run it. If the marks move, the prop is spun. Buy a new or used one.

NOW: If you can spin the prop (in gear) without turning the engine against compression, it is spun. However, spin it the wrong way--that is if in forward gear, spin it reverse. This is because of the taper on the gear drive dogs (inside the lower unit) If you spin it the correct way the dogs will ride over each other with a clicking sound.

 

[aaronkumlien]

Re: help with chrysler 25 please.

thanks for commenting frank but i dont think the hub is spun. if you look up further on my posts i said that it is not going into either gear and is not spitting water which leads me to believe it has something to do with the main shaft. would a spun hub cause the motor not to pull water through the engine? if you look at my pictures which i took to show where i was at, the first pic is the drive shaft that goes or seats into the engine. all of the keys or groves on the shaft where covered or filled with what seemed like dry oil or something. it the shaft was seated properly, it should have been clean already right? also it looked like there was a little shearing of the keys but i think the majority of the shearing happened in the engine part of the drive shaft. i dont want to run the motor not spitting water and the shaft is turning when the clicking comes so the prop is not spinning on the hub, the drive shaft is not catching or working.