<VV> RE: "must be an overhaul"

[srmarti]

Remanufactured nothing undersize or oversize.  So a re-manufactured engine
would not have a block bored and fitted for oversize pistons?  Crankshafts
aren't ground undersize and bearings re-fitted?

Overhauls. What's replaceable? Everything. Where do you stop? Cam yes? Crank
no"  Cam drive system?  Rockers yes? Pushrods no?  Doesn't seem that simple.
Do you grind valve seats and not check guides and stems? New valve springs?
Every bolt is replaceable.  I don't know if that means every single fastener
automatically gets replace with new during an overhaul.

Still sounds to me like there's a lot of wiggle room for what is done vs.
what you call the job.

FAA probably has a fairly extensive description for aircraft engines, but I
don't know if that correlates to auto industry practice well.  Large
production style shops probably have developed  standard processes.
Individuals or small volume shops?  Also going to depend on capabilities
available, etc.

Steve Marti


>
>
> In the trades it is still:
>
> Overhaul =  replace all replaceable parts , grind valves , NO MACHINING!
>
> Rebuild =   All the above with all WEAR SURFACES re-machined...so
>   bearings
> / pistons MUST be repalced.
>
> Re-manufacture =    All the above PLUS  all dimensions brought back to
> original!  Nothing under/oversized.
>
> NOTE:  things on Corvairs like the oil pump/ blower bearing,
> idler bearing,
> distributor bushing /plate, etc.  are up to the owner/shop.
>
> The reason no one overhauls any more [ shops]  LABOR is too much....
>
> Rebuilds /re-mans are usually done in large shops with cheap labor!   An
> "engine assembler"  is NOT a mechanic /Technician!