85 hp Force lower unit type C rebuild questions

[DeFeet63]

I did a seach and did not find answers for the following questions. I have three manuals that refer to driveshaft holding tool...is that something I can buy? If so where would I find one. Is there a company that sells the parts that I will need to reassemble my lower unit? Not sure what the damage is but I would assume it is in the clutch dog or pinion gear. I have the lower unit off and should have the prop shaft out tomorrow, and then I would think I can find the problem. The problem, on the last Sat...a klunking sound came from the engine...but only when in gear...gear oil had minor metal flakes, but no water...oil was quite black, any help would go a long way. Thanks

 

[alcan]

Re: 85 hp Force lower unit type C rebuild questions

That tool is to hold the drive shaft so you can loosen or tighten the pinion nut. This tool is used by the pro's to make the work easier and save time. You are not in a hurry. Just clamp the drive shaft between wooden blocks (vice pads) in the vice. Since your not in a hurry, take your time so you do not break any thing.

 

[DeFeet63]

Re: 85 hp Force lower unit type C rebuild questions

Thanks I was thinking about trying that...but was not sure if I was missing something...I will see what went wacky and get a parts list going....do you know of a good source for the lower unit parts? Thanks

 

[DeFeet63]

Re: 85 hp Force lower unit type C rebuild questions

Got it...now...looks like I need a few parts. Foward gear was broken up the worst ...Pinion, and Reverse were not as bad but need replacing. Lots of debris in behind the forward gear bearing race. The bearing races look ok. So, should I just order the broken gears and clean it up...or...do the bearing races and bearings while I have it down. Also looked like the inner casing of the lower unit has some deep scatches from the damaged parts, is that something that will be ok to use. <br />1. Where to order parts?<br />2. Should I redo the bearing and races?<br />3. If I do that, I need the tools that are special for the job.<br />4. Should I just buy a rebuild?<br /><br />Thanks, kids need to be on the lake soon.

 

[eurolarva]

Re: 85 hp Force lower unit type C rebuild questions

Please post your model and serial number. Force made a lot of 85 HP motors and they all have some differences

 

[DeFeet63]

Re: 85 hp Force lower unit type C rebuild questions

Model # 856x6L<br />Serial #4975<br />Thanks

 

[eurolarva]

Re: 85 hp Force lower unit type C rebuild questions

Here is a starting place. This link will take you to your lower unit parts. These are mercury numbers and you can get them from your local merc dealer. Some of the parts are no longer available. Here is the link 85 lower unit <br />Keep an eye on ebay for lower units for sale. Try and get one for around 100 bucks. Some of the parts in them may be crap but others may work for you. Good luck

 

[DeFeet63]

Re: 85 hp Force lower unit type C rebuild questions

Eurolarva, thanks for your help...ordered em right on line...next day shipping, if they have them in stock. I looked at the forward bearing on my gear housing it looks good and smooth...so it can stay put. What is your oppinion of the inside of the lower unit itself (the housing) should I try and clean up the scratches? <br />Many thanks Shane

 

[eurolarva]

Re: 85 hp Force lower unit type C rebuild questions

If they are just scratches I would not worry about them. The thing I would be most worried about is the gears. I believe they have to be shimmed correctly or they will wear down fast. My clymore explains how to do it for my chrysler but I think I would be a little reluctant to do it. If you are good a following instructions then you are probably okay doing it. Then again if you are not replacing the forward gear it should be okay. You should also get a seal kit for that unit and replace all the seals. A kit should run about 30 bucks.

 

[DeFeet63]

Re: 85 hp Force lower unit type C rebuild questions

As for the scratches I think I will not worry and just make sure it is clean in there....I am a bit confused about the bearings...From what I have read...if I replace the worn gears (forward, reverse, and pinon) and the forward ballbearing ...But use the old bearing serfaces (top driveshaft and the forward) bearing , then it is not nessesary to shim...but I might be wrong. I have the seal kit coming...I plan on replacing all the gears/ballbearing and leaving the bearing serfaces in place.<br /><br />Thanks

 

[eurolarva]

Re: 85 hp Force lower unit type C rebuild questions

The shimming thing is something I have never done and I have a chrysler not a force. My understanding is that the shims go between the reverse gear and the bearing in the bearing carrier or bearing cage. Also a thing called an end float measurement needs to be done also. This is to determine how thick of a thrust washer needs to be used. This stuff is all greek to me but if it is not done correctly the gears can engage too far or not far enough causing damage. Hopefully someone here that has done this type of work will be able to help you with this. This may not even apply to force. I would hate for you to dump these parts into your motor and have them burn out again.

 

[DeFeet63]

Re: 85 hp Force lower unit type C rebuild questions

Thanks I think on a Force, that applies if you replace the bearing serfaces...they have shims behind them. I will re-read my book...and hope someone reads this before I put things back together. I do have three manules from different companies so...maybe I can find the answer there. Thanks again for your time and help. The DinaJoe might just get wet soon.

 

[DeFeet63]

Re: 85 hp Force lower unit type C rebuild questions

Got my parts today...will update...with good news I hope.

 

[DeFeet63]

Re: 85 hp Force lower unit type C rebuild questions

Did not get the impeller or the yoke...they did not have them in stock...any other places that you recomend for these parts? The water pump kit was back ordered. Thanks

 

[eurolarva]

Re: 85 hp Force lower unit type C rebuild questions

It looks like a 18-3065 impeller will work for your motor. Iboats sells them iboats impeller. I dont know what the yoke is. If you ordered the parts from the merc site you might be able to get them from your local merc dealer. Just give them the part numbers from the merc site. They may have them in. I believe NAPA also sells the 18-3065 impeller

 

[DeFeet63]

Re: 85 hp Force lower unit type C rebuild questions

Did a dry rebuild today...just to see what I am up against. My book does recomend using a shim tool to make sure the pinion gear is not too tight on the forward gear...so I am ordering the shim tool for the lower unit tomorrow...my manual also said that if I change the front gear bearings that the race should be replaced at the same time. But the mercruiserparts does not make or sell the front bearing race anymore...any advise?

 

[eurolarva]

Re: 85 hp Force lower unit type C rebuild questions

take the race to a bearing shop. They should be able to fix you up