[Pieter Wuille]

The not going past 20 lbs is the bolt twisting and shearing. Take it any farther and you'll be having fun with an ez out pretty soon.

[darkside]

Mercury specifies a procedure for very relevant and well documented reasons. In manufacturing there are best practices and then there is everything else. Remanufacturing to lower standards than the factory does initially makes zero sense to me. The factory does it that way for warranty reasons. It saves them money or they wouldnt specify it as a best practice.

[jesicaaba13]

It is a very basic principle of solid mechanics and modern engineering that bolts stretch. It has nothing to do with any belief system I might have. Even bolts that are threaded into a softer metal stretch if they are properly torqued. That is how they clamp things together. It is by the "stretchiness" or elasticity or the fastener that causes clamping force. A bolt that stretches but does not permanently deform goes through a process called elastic deformation. It works well but does not provide maximum clamping force. Maximum clamping force can be attained without exotic alloys or expensive time consuming heat treating methods by putting a medium grade of bolt through plastic deformation where the bolt stretches to the point it aint gonna stretch no more. The issue with bolts that have gone through plastic deformation such as TTY bolts is that they never go back to the same dimensions or grain that they were at to begin with. The more times they get used the worse it gets until eventually they fatigue and shear or they lose tensile strength and twist until they break. Those are principles that are well founded and well documented and whether a bolt is used in a outboard or a moped or a nuke plant or a 2000 HP dragster application doesnt make those principles change. An X ray of a bolt that has undergone plastic deformation just once versus one that has undergone elastic deformation is very telling. If you ever get really bored look up Young's Modulus and Hooke's Law and how those principles pertain to fasteners. Good times with bolts.

[agp]

I've NEVER bought a new torque to yield head bolt on the O ringed headed motors always used the used ones with 100% success , and those OEM bolts AIN'T cheap . I torque to a end torque value of 35 ft lbs , NEVER HAD A HEAD GASKET LEAK !

[BitCoinPurse]

So, you replace the head bolts every time the heads come off?

[bdimych]

Yall must be mixin up fishin and race motors. Merc don't sell head boats or rod bolts for a performance division motor for that cheap. Just because an engineer says it don't mean its gospel. ESPEACIALLY when it comes to race motors. Those same merc engineers told us years ago( when they actually cared to show up at our races ) that we cant do what we were doing with them motors. Well they sell you that **** now. Lab life and real life don't always get along and no matter how hard you try to deny it , Real life wins the bet everytime. here

[astrid01]

This outboard is mounted with stainless steel bolts and a double stainless nuts. The white residue on the bolts is from sealant.

[L29Ah]

All that said, there is an important caveat to using stainless steel bolts for this purpose, which is really the origin for the galvanized bolt side of the debate.

[FrY10cK]

Factories are using stainless bolts and nuts to mount outboards. These fasteners need to be carefully installed to prevent crevice corrosion.

[Regent]

Question: My friends and I are having a heated debate over what type of bolts to use when mounting an outboard engine. Some say the answer is to use galvanized regular steel bolts, grade five or better. Others recommend using stainless steel. I’m planning a repower on my center-console this winter and want your take on it.

[sehrgut]

So is it normal practice to grease up bolts during assembly? If so, I'm a big believer in it after taking this salt-only motor apart. Could this be some kind of marine anti-seize perhaps?

[eurobtc]

Be careful what grease you use , go to a boat shop and ask what there mechanics use !.
I use lanocoat grease made from the lanolin from sheep's wool on every thing i have ever taken apart and never had a problem.
I also wash down with warm soapy water and spray crc all over everything when its dried off .Be generous with it so it gets to all the places you cant see
Seems when the motors are assembled theres no grease used at all !. Stainless and aluminum + salt always stick together ! best loctight combination Ive come across ever !.

[denger]

Twin 1991 Yamaha 130TXRP outboards
The steering arms have rusted all the way through. Port side is broke and starboard side bends easily.

[pavelo]

Twin 1991 Yamaha 130TXRP outboards
The steering arms have rusted all the way through. Port side is broke and starboard side bends easily.

[ianwgner1]

Audi 5-cylinder 10V undercut 12pt
204-4703

[diggler]

Audi RS3/TT-RS 2.5T 12pt ARP2000
204-4708

[Cruzz]

VW Audi 5-cylinder 20V 12pt
204-4207

[Mira]

VW Audi 5-cylinder 20V 12pt undercut
204-4704