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Two engine halves equal one engine?
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@rikko avatar
Rikko
UTC
Hooked
LML Vespa 150N
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Posts: 477
Location: at Sea
 
Rikko
Hooked
@rikko avatar
LML Vespa 150N
Joined: UTC
Posts: 477
Location: at Sea
UTC quote
Has anyone successfully replaced a half of engine casing? PX engine, 200 possibly.

For an example one half is damaged and mandates a replacement. And let's assume this half is available new. Would the crankshaft bearing seats in this newly put together engine have to be line bored in order to ensure that crankshaft is positioned correctly? 🤔

Thanks in advance
FridayMatinee
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Ossessionato
1958 Allstate 177VMC, 1962 Allstate, Yamaha Vino 70cc
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Location: Philadelphia
 
FridayMatinee
Ossessionato
1958 Allstate 177VMC, 1962 Allstate, Yamaha Vino 70cc
Joined: UTC
Posts: 2847
Location: Philadelphia
UTC quote
Rikko wrote:
Has anyone successfully replaced a half of engine casing? PX engine, 200 possibly.

For an example one half is damaged and mandates a replacement. And let's assume this half is available new. Would the crankshaft bearing seats in this newly put together engine have to be line bored in order to ensure that crankshaft is positioned correctly? 🤔

Thanks in advance
No.
The cases originally are machined together.
Getting a new side you have a 50/50 chance of things lining up properly.

Can it work? Possibly. I have a mismatched case set on my shelf. One day I'll put it together just to see.
@birdsnest avatar
Birdsnest
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VNB VSC VSX Li150 09C C125 - (vmb vse v9b)
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Birdsnest
Not So Moderator
@birdsnest avatar
VNB VSC VSX Li150 09C C125 - (vmb vse v9b)
Joined: UTC
Posts: 10328
Location: Hustletown, TX
UTC quote
My p200 has mismatched halves... but they are somewhat close in age/production. It is definitely not recommended, but... it can be done in a pinch with varying degrees of reliability/safety.
@safis avatar
SaFiS
UTC
Veni, Vidi, Posti
1979 P150X, 1983 P200E, 1987 PK125XL Elestart, 1988 T5, 1995 PX200E, 2024 GTS 300
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Location: Veria, Greece
 
SaFiS
Veni, Vidi, Posti
@safis avatar
1979 P150X, 1983 P200E, 1987 PK125XL Elestart, 1988 T5, 1995 PX200E, 2024 GTS 300
Joined: UTC
Posts: 5258
Location: Veria, Greece
UTC quote
I've run mismatched 200 cases with no issues. Both were aligning though at the cylinder base…
whodatschrome
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parallelogramerist
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whodatschrome
parallelogramerist
Joined: UTC
Posts: 6136
UTC quote
I've used mismatched 200 cases before. Of course it's not ideal, but if it happens to work just fine, then run with it.
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