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How far to go with engine strip downs - being sensible about old seals etc

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McCabe-Thiele (Ted):
 Now that my little engine has run I'm turning my mind as to how far to go with an engine strip / down rebuild.
My original thought was to remove the cylinder head for valve grind, valve stem seals if they have them and checking piston tops etc.
That got me thinking about stuff like crank oil seals etc if they have them.

Without going OTT on cost what do folk here do in terms of knowing how far to go with a rebuild - any pointers / advice  as to essentials whilst the engine is out sought here. I will have to strip the clutch as the plates are bound to be stuck plus I am not in a situation to know if the gearbox is in good condition. If the piston tops look good I'm not keen to remove them unless its essential as part of the rebuild

I'm not afraid of the work involved more of an eye on cost and time involved in engine / gearbox strip downs.

Nurse Julie:
Personally, I would advise stripping the complete engine Ted. Fit all new engine seals, hyvo primary and cam chain, make sure the cam chain horse shoe pivot is free and working, check gearbox over etc.

Skoti:
Of course Julie gives good advice.

But you may want to follow the principle of "if it's not broken don't fix it".

When my old CB750F1 was resurrected I first serviced the motor, then run it and addressed issues as they appeared.

But for example loads of stuff including crank and gearbox oil seals etc are still original and working fine.


Good luck with your project.


 
 

Laverda Dave:
I think once you remove the rocker cover and inspect the cam and rocker condition they will provide a good indication of how the engine has been previously looked after.  The top end of the engine is what suffers most when oil and filter changes have been neglected.
Once you remove the head to inspect the pistons and bores you will really know what you have on your hands.  Any signs of rust/scoring etc will point to a full stripdown.  As a minimum I would remove the sump pan to check the primary chain, cam chain tensioner horseshoe and the tensioner plunger. The contents of the sump pan will also provide a good indication of the state of the engine.
Read Julies rebuild thread for a good example of what may be lurking around the piston area as an excellent example of how to inspect the engine and what may be lurking within.
Not to worry if you find various nasties, lots of help and advice on here. I sense a nice winter rebuild coming on....................
Good luck :)
Dave

McCabe-Thiele (Ted):

--- Quote from: Skoti on September 25, 2020, 08:23:32 PM ---Of course Julie gives good advice.

But you may want to follow the principle of "if it's not broken don't fix it".

When my old CB750F1 was resurrected I first serviced the motor, then run it and addressed issues as they appeared.

But for example loads of stuff including crank and gearbox oil seals etc are still original and working fine.


Good luck with your project.


 

--- End quote ---

That was my late Fathers maxim - if it aint broke dont fix it - when I was a teenager I  ignored it of course dismantling things that sometimes I could not put back together. lol

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