Catigale wrote:You have to be a real dumb a*** to drop your motor, don't you..?
On loosening head bolts ..I think you want to heat the head, not the bolts, to free them up..
Yes I did CatCatigale wrote:Im guessing the head/block are Al, and the bolts are steel of course.
Al has larger thermal expansivity (amount it expands on per unit heat applied) so the goal is to expand the Al head around the bolt, while keeping the bolt at room temp or near, so that the thread tension on the bolt is lowered...
In case you missed earlier thread, I managed to dunk my motor twice in the last month...
thats why I laughed and said.. yes we.....do hahaha... But I have a different opinion on what will take place when you heat that AL head.. That head will expand vertically as well, and now you have expansion pressure added to seizure/friction issues..BUT I am No Metallurgist nor am I a Physicist. I have only had one experience with this problem and that was with an Al. Head V-8.... an L88 IIRC. 
Twice!That's great!Catigale wrote:Learns tonnes and have funne too!
Divecoz wrote:Vizwhiz are you me under another name? ( that should start the rumor mill going
Yes I too have reused head Bolts on Gas Engines in a pinch or when the compression level was low.. Just take you time , do it in the order specified in the manual and use a good /decent torque wrench..
I too have never done this on a Big Outboard Motor. But I did on a small 1983 6HP Evinrude Twin. Some MORON ( mewith WD 40 and had her running... sort of
I tore her down, cleaned everything ... really good... replaced Nothing but the plugs, made a number of adjustments and had her running better than she had when I had bought her a couple months earlier.
vizwhiz wrote:Something to mention - head bolts are usually considered "strain bolts" - they are made to stretch under load, and as such, can usually only be used once. Now I say "usually" because (a) when you're in a pinch you do what you have to do and things can often work just fine even though they aren't to "factory spec", and (b) I've replaced many head gaskets where I've re-used the head bolts and the motor ran just fine. (none were on outboards, however)
The reason I mentioned it is that outboards tend to be high power-to-weight ratio, lightly-built motors (not light-duty, built to weigh little) using alloys and such, and the head bolts and other fasteners and items like them can sometimes be more specially designed than an older cast-iron-block motor that uses regular off-the-shelf bolts and nuts.
I will defer to others on here who have rebuilt outboards and can attest to whether it is an issue, but the trouble can come when trying to get the head tightened back down evenly and with proper torque to make sure you don't blow a head gasket...
But I agree - you learn a TON of stuff (tonne?) from undertaking a project like that - even if you finally give up and throw it all in a box and haul it to the junk pile...it is definitely worth the effort if you are half-way inclined to try! Couple old tricks... (1) masking tape and marker - tag all the wires and hoses and even small covers and such with which end goes where, what it was connected to, up/down, or something that will help you get it back in the right way. Digital pics can be useful now if you'd prefer. (2) As much as possible, if you take a bolt/bolts out to remove a part, screw it/them back in the hole/holes and leave them where they belong...especially if there are different size bolts used on the same part (long bolts on one side, short bolts on the other, etc.) Sometimes, this by itself can help you figure out where something goes (that bolt is long, so the part must be bigger than this one I'm holding).
Have FUN, even if there are parts left over...
Divecoz wrote:DaveB :
You just cannot imagine... How much we look forward to getting down there and away from this COLD! Its been put off for numerous reasons for several years .. but we feel we have gotten, just about got all our ducks in a row now .. One more Operation for the wife and selling this house and we...are there!
I feel like I know Pelican Bay like the back of my hand hahaha .Safe Harbor Several times on that trip... I sailed from Pelican to, past Boca Grande in a Gale , just, to prove to myself I could Really...do it.. Did it once and I will never be so foolish again...
We're going camping that weekend! That would be our first trip of the season - our "shake-down" trip for the rest of the camping season...DaveB wrote:If you are in Port Charlotte ,FL. you may want to Join us for a good camp out and Bonfire at Cayo Costa Northern Sand Spit in Pelican Bay. Nov. 12 thur the 14th.
