Bolt lube?

[Biotweed]

Hello I have a 1995 yamaha C75 outboard. I have just started to replace my upper shift shaft. I am also replacing the impeller. All is going well with these jobs, but (oh yes there is a "but") I am getting conflicting advice and I need some one to set me straight. I have three sets of bolts to replace. All the bolts eleven powerhead mouting bolts, five lower foot bolts and four waterpump bolts came out fine(I know a miracle right). The book I have on my motor says to use loctite#241(blue) on the waterpump bolts, and loctite#271(red)on the powerhead and lower foot bolts when reassembling them. The man at the boat shop says to use anti-sieze on all bolts. Then the guy at the yamaha shop(expert) says to use waterproof grease on all bolts or I will be sorry. I use the boat in saltwater mainly. Can someone please tell me what I need to use on these bolts? Any tips will be appreciated. Thanks

 

[Peter J Fraser]

Re: Bolt lube?

Listen to the man in the shop.<br />Waterproof grease or similar lube (Prop shaft paste)is fine but be careful if you are winding the bolt into a blind hole as you risk blowing out the hole from hydraulic pressure if you overlube the threads.<br /><br />Some anti sieze pastes are not compatible with aluminum and salt water, use caution here. <br /><br />Loctite compounds are great if you dont want bolts etc to come loose but they make fasteners difficult to remove at the least. <br /><br />Good luck,<br /><br />Peter

 

[Biotweed]

Re: Bolt lube?

Well which shop do you mean? The boat shop man or the yamaha shop man? I do not think I will need to open these connections again, so I am leaning toward the loctite. Does the loctite keep the corrosion from forming around the threads? Do you think that lockwashers and torque with anti-sieze are enough to keep a bolt in an outboard with all the vibrations? When I removed the bolts they had a green paste around the threads, is this loctite or anti-sieze from the factory?

 

[vinney]

Re: Bolt lube?

Waterproof grease on all bolts. (lightly). That green paste is waterproof grease mixed with water clean and regrease.

 

[Biotweed]

Re: Bolt lube?

Thank you Vinney and Peterf, information is the best tool. I will use the waterproof grease(lightly). I just sure hope the bolts do not back out. Thank you again and safe boating everyone!