PeterMcK
New Member
Moody 33 mk 2, original mechanicals.
I'm trying to split the shaft coupling from the shaft without much success. I've made up a jacking plate to press the shaft out using bolts through the two-bolt flange, having first removed the (concentric) pair of tension pins locking the shaft to the coupling. The shaft is slightly undercut from the 1 inch dia where the coupling is fitted and is keyed. No grub screws or anything else locking it.
Have tried blowlamp. Lots of force on jacking plate. Tapping as much as I can, given access. No joy. Was soaked in penetrating oil for all of last year in anticipation. Tension pins came out like new.
Considering that it seems that astern thrust would be otherwise taken by only the tension pins, the coupling wouldn't be a shrink or press fit, would it?
If that was the case, then the only way to dismantle the stern gland, more particularly, its rubber gaiter, would be to remove the engine first, or just maybe, to remove the p-bracket and possibly fiddle the shaft through the engine space. I can't imagine it was planned that way but, on the other hand, having tension pins alone take full astern thrust seems like an even worse bit of design.
Unless I can move it in the next few days, Plans B and C kick in -
P-bracket off (fixed by 4 easily accessed studs in aft cabin and, I think ... flange lightly faired with gel coat under hull) and fiddle shaft out past engine and through engine space.
Or ... destroy half coupling and try to source a split coupling to replace it. Two-bolt TMP gearbox flange setup makes that unattractive, probably a custom job, and it's a bad time of year.
Would try MOA forum but my membership has lapsed, need to send snail mail standing order stuff to get posting rights and, inevitably, I'm in a hurry ...!
If it's definitely not a shrink fit, I'll persevere.
I'm trying to split the shaft coupling from the shaft without much success. I've made up a jacking plate to press the shaft out using bolts through the two-bolt flange, having first removed the (concentric) pair of tension pins locking the shaft to the coupling. The shaft is slightly undercut from the 1 inch dia where the coupling is fitted and is keyed. No grub screws or anything else locking it.
Have tried blowlamp. Lots of force on jacking plate. Tapping as much as I can, given access. No joy. Was soaked in penetrating oil for all of last year in anticipation. Tension pins came out like new.
Considering that it seems that astern thrust would be otherwise taken by only the tension pins, the coupling wouldn't be a shrink or press fit, would it?
If that was the case, then the only way to dismantle the stern gland, more particularly, its rubber gaiter, would be to remove the engine first, or just maybe, to remove the p-bracket and possibly fiddle the shaft through the engine space. I can't imagine it was planned that way but, on the other hand, having tension pins alone take full astern thrust seems like an even worse bit of design.
Unless I can move it in the next few days, Plans B and C kick in -
P-bracket off (fixed by 4 easily accessed studs in aft cabin and, I think ... flange lightly faired with gel coat under hull) and fiddle shaft out past engine and through engine space.
Or ... destroy half coupling and try to source a split coupling to replace it. Two-bolt TMP gearbox flange setup makes that unattractive, probably a custom job, and it's a bad time of year.
Would try MOA forum but my membership has lapsed, need to send snail mail standing order stuff to get posting rights and, inevitably, I'm in a hurry ...!
If it's definitely not a shrink fit, I'll persevere.