Want to install new water pump but lower unit will not seperate!

[Old and Rusty]

1974 Chrysler 75 hs. 3 cyl. Model 757HA<br />Want to install new water pump or impeller because of no water discharge when running.It's been sitting for a while and the trouble I've had loosening the bolts and nuts and screws tell me that this unit has not been apart for a long, long time.Four of the six bolts holding the lower unit to the upper unit snapped off because they are corroded so bad.Even the hidden bolt inside the trim tab snapped off.I'll have to do lots of drilling out and repairing holes if I can ever get the lower unit to let go.<br /> I removed prop. and shaft and bearing.I can see the pinion nut,bearing and end of drive shaft.I removed the pinion nut and the lower unit dropped about 1/2 to 3/4 of an inch but no more.I take it by the manual that the drive shaft should release from topside and the whole thing should drop.This is not happening.If the pinion brg. would finish sliding off the driveshaft then it would drop also,but this not happening either.I've chipped the casing in a couple of places prying and pulling on it.<br /> Does anyone have any ideas or suggestions?

 

[karlbyrne]

Re: Want to install new water pump but lower unit will not seperate!

I have a Force 85hp 1988 and also had the impeller replaced recently. I know it's not the same engine but mine had 6 nuts (as you describe) BUT there was also another that had to be removed with an alan (spelling?) key. It was up a tunnel (if you can imagine what I mean) and needed a long and large (I think 1/2 in key) to remove it. Found a site through this site that diagrams of engines try www.dougrussell.com/partscatalog then follow Force/type etc on the left of the screen. It explains a lot when you see the diagram in front of you. Hope this helps.

 

[Old and Rusty]

Re: Want to install new water pump but lower unit will not seperate!

Karl,<br /> Thanks for responding.I tried the site you talked about and it is a great site.The only problem is it doesn't have an image of my motor model.Again thanks for trying to help.<br />Preston

 

[SeaMasterZ@aol.com]

Re: Want to install new water pump but lower unit will not seperate!

you really should get a manual for that puppy, especially since its a chrysler!<br /><br />one exploded diagram can save YOU from several explosions!

 

[sharkcat]

Re: Want to install new water pump but lower unit will not seperate!

I would think the driveshaft has corroded into the crankshaft.You may have to cut a hole in the centersection to get some heat on the shaft up near the powerhead.Good luck

 

[Old and Rusty]

Re: Want to install new water pump but lower unit will not seperate!

Ray<br />Thanks for responding. I do have a manual,thats the only way I've gotten this far.The problem is that the manual is excellent but doesn't give info for a scenario like mine.It only gives info for a smooth operation.I'm on my own in this situation.<br />P.B.<br />Sharkcat<br />Thanks for your responce,I will try your suggestion.This old gal is very corroded everywhere else I'm sure the driveshaft is no different.Thanks.Will let you know how it goes.<br />P.B.

 

[dbajaer]

Re: Want to install new water pump but lower unit will not seperate!

You could have a hidden bolt! For example the honda 50 has one under the trim tab, probably has caused a lot of grief for many. Best to check the book.

 

[OBJ]

Re: Want to install new water pump but lower unit will not seperate!

Hey old and rusty...<br /><br />Did ya disconnect the shift rod? The rod link should be, I think, just above the lower unit on the front of the midsection. If ya' did, then I would have to agree with sharkat, the splines on the driveshaft have corroded into the crankshaft.<br /><br />Good Luck Partner. Keep us posted.

 

[Old and Rusty]

Re: Want to install new water pump but lower unit will not seperate!

Thanks dbajaer very good point but with the manual I have... I found that one.Appreciate your suggestion though.<br />..................................................<br /><br />Thanks Outboardjim but that has been done also.I have no doubt that the problem is probably the two are corroded together.It just seems so extreme to have to cut a hole in the centersection. I'm sure it will come to this but my confidence in me doing it is not at an all time high.I have 4 oak wedges driven in between the two sections but I don't have much faith in that working.<br />If I do decide to take a crack at cutting a hole....could someone give me advice on the best way of doing so.I also would like to have an idea of where the best place would be to cut the hole.I'm not sure how high up and the shaft seems to be closer to the front of unit and part of the upper casing is right there if it needs to be up very high.Thanks so much for everyone's help...the manual is good but no help with this type of problem.

 

[Old and Rusty]

Re: Want to install new water pump but lower unit will not seperate!

I have finally dropped the lower unit.The problem is the shaft came loose from the pinion brg.in the bottom of the lower unit.The shaft is still corroded or whatever into the crankshaft up top.I can't get the top of the water pump housing with the impeller to slide off because of the seal and brg. that seats under impeller inside bottom of water pump housing.Thats all thats on the shaft now.The water pump housing top with old impeller and seal and brg.Should I try and remove this brg. and seal,replace the impeller and let the shaft stay as it is? If I can remove the motor ( this doesn't look like the easiest of things )from the boat and turn it upside down and pour solvent around the ahaft do you think it would release? Help me guys I'm at a loss and my determination to get this old gal going is waning fast.It has definitly turned out to be a lot more than I bargained for.Thanks

 

[jim phillips]

Re: Want to install new water pump but lower unit will not seperate!

I dont know a thing about your moter but keep at it slow and steady.When you win,it will be worth it just because you beat it

 

[Walker]

Re: Want to install new water pump but lower unit will not seperate!

PB Blaster works wonders, especiall if you can stand that motor on its head.

 

[Hooty]

Re: Want to install new water pump but lower unit will not seperate!

Another option, and I'm not sure if it would make it any easier or not, is to reinstall the l/u and try pulling the powerhead. <br /><br />c/6<br /><br />Hooty

 

[Hooty]

Re: Want to install new water pump but lower unit will not seperate!

BUMP

 

[OBJ]

Re: Want to install new water pump but lower unit will not seperate!

Rusty, might try a long shot here. Put a strap wrench on the flywheel to keep it from turning. Put a pipe wrench on the shaft and smack it with a large hammer in the direction of rotation, clockwise. Put the wrench on a part of the shaft that is not a sealing area. It can be dressed up later. If you can keep the flywheel from turning, you may jar the drive shaft lose. Yea guys I know, it's a "get a bigger hammer mech" talken. But sometimes a bigger hammer works!

 

[Old and Rusty]

Re: Want to install new water pump but lower unit will not seperate!

Outboard Jim,<br /> Sounds logical to me.It's the only way I dropped the lower unit ( Oak Wedges and "A BIG HAMMER")The Waterpump Housing was so badly corroded to separate it I had to use a thin pry bar and "A BIG HAMMER".I think the only thing this Old Gal really understands is "A BIG HAMMER".<br />I also think if this doesn't work I am going to hit myself in the head with "A BIG HAMMER" for buying it in the first place...LOL... just kidding.I'm in this now for the long haul.I know that "A BIG HAMMER" is not the Kosher way of doing things but I think I have to agree with Outboard Jim....sometimes a man gotta do what a man gotta do!!! Before I take this baby off and turn her upside down I'm going go for it.Thanks Outboard jim and "EVERYONE" for your words of encouragement and great suggestions and advice.I'll keep you posted and keep an eye on the News Report about a man going POSTAL on his Outboard Motor in rural Virginia.

 

[sharkcat]

Re: Want to install new water pump but lower unit will not seperate!

I thought an outboard mechanics toolkit consisted of: hammers of various sizes, a couple of screwdrivers,shifting spanners,JB weld lots of this if your name is hooty ,a shovel (to bury it or turn it into a garden ornament when it goes legs up ) & a case of beer to drown your sorrrows ....Good luck patience is a virtue but brute force & ignorance sometimes works too!!

 

[OBJ]

Re: Want to install new water pump but lower unit will not seperate!

Ya' forgot the harsh language and the ability to improvise new descriptive adjectives to decribe what you feel about the current project which goes beyond current bad language as we know it. Lots of beer.....lots of beer.

 

[sharkcat]

Re: Want to install new water pump but lower unit will not seperate!

Outboard jim there is only one response to that <br />AMEN good luck