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CB750F2 .... silk purse from a sows ear.
philward:
That's what I did with my Phil Read Rep Brian - when I had access to the right equipment at Bae
Sent from my Moto G (5) using Tapatalk
SumpMagnet:
OK...still not 100% whether I should reuse the worn cam bearing surfaces, but I shall park that question for now. If a great set turns up at a pricve I can sort of afford...I will snag them. Failing that...it's a bridge I shall cross when I come to rebuild.
I already know I need a new set of pucks, and hte 4 o-rings under the carriers were so hard they would serve as washers...not o-rings. I tried to bend one....and it snapped. Haven't got the oil jets out yet, but I will need to use a needle or similar to pick out the o-ring. I won;t bother trying to be kind to them, as they will be just as scrap as the outer ones!
First though....I have to get the head off. Damn thing will not budge!
I have undone the 12 M8 nuts around the base of the cam carriers. I have undone the 4 dome nuts hiding by the spark plugs. I removed all 6 rock hard mini frisbees and undid the 4 M6 bolts hiding under there. I undid the M6 bolt at the front of the camchain tunnel...and the sneaky hidden one at the back. So ....16 nuts and 6 bolts accounted for. Head will not budge.
Much tapping with the rubber mallet...not a thing.
I have a very nice and undamaged set of fins...which I would like to keep... so before I get tempted to a lump hammer and wooden drift, or banging wooden wedges in between head and barrels....have I missed anything obvious? I have dribbled some oil down all the studs in the hope of releasing any sticky corrosion, which should just leave the 40yr old head gasket to shift.
I have taken heads off before...never one this old...but it seems like it is far more stuck down than it ought to be. Makes me wonder if I missed a bolt!
If I haven't missed a bolt...is there a good way to shift this thing without risking damage?
As a not very humourous aside....I noticed quite a few sellers on E-Bay offering cam carriers, rockers etc. for sale. In every case....EVERY picture was taken in such a manner that you could not see the bearing surface that mattered. DK Spares were asking some pretty steep priced parts like this, with the caveat of 'sold as seen' ... One other seller offered a set so chewed up it looked like a ploughed field. I know E-Bay can be a valuable source of material...and a valuable source of knackered junk too...but surely a legitimate seller would want to show everything.......
Nurse Julie:
Original Honda head gaskets are very, very sticky and can be a right pain, bordering on impossible to shift.
Bryanj:
Always replace all rubber bits on rebuild
SumpMagnet:
hell yes.... Julie mentioned it right at the start, and so far I have seen exactly why. The carb rubbers are like steel....the o-rings are brittle, the pucks had to be peeled off the carriers like old chewing gum off the sole of your shoe...
And that's just the top end.
I will be replacing every bit of rubber I possible can, as none of these items will ever seal, and would most likely crumble to dust. I do need to find a source of replacement rubbery bits though. Seen a few sets of 'engione rubbers' ... but no description of what's included. So will need to make a few phone calls before I unlock the credit card.
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