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Strange iregular shaped hole in side ...

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matt harrington
Member
Username: matth

Post Number: 12
Registered: 01-2008
Posted on Monday, March 10, 2008 - 09:13 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

i have just been given an unrestored p55, it seems to have a keyhole shape cut in the side of it, i assume its not meant to be there or is it a crankcase breather or something?
application/octet-stream
Doc1.doc (35.8 k)
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Peter Ogborne
Senior Member
Username: peterogborne

Post Number: 251
Registered: 09-2002


Posted on Monday, March 10, 2008 - 06:02 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Matt a bit more info would help ,better still an image. There is no breather ,its all part of the two stroke cycle. The only opening to the crankcase is the carburetor mounting but this is not irregular nor is it key hole shaped .
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Malcolm Russell Ward
Member
Username: russell

Post Number: 20
Registered: 08-2003


Posted on Wednesday, March 12, 2008 - 03:52 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Do you think it might have suffered some internal derangement and a part tried to get out? Is the hole regular? Does it look machined or punched out and are there any cracks visible? Is it in line with one of the con rods? The poor thing wouldn't run without good crankcase compression. Sorry I couldn't open the picture.
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Peter Ogborne
Senior Member
Username: peterogborne

Post Number: 252
Registered: 09-2002


Posted on Wednesday, March 12, 2008 - 05:29 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Like wise ,I could not open the image if that is what it was ..........we need more info before anyone can be of assistance.
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Brian Marriott
New member
Username: pdp8user

Post Number: 3
Registered: 05-2006
Posted on Thursday, March 13, 2008 - 06:59 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Here's another format of Matt's picture. I was able to read it and convert to PDF.
Brian
application/force-downloadPDF of Matt's picture
Doc1-109179.pdf (32.3 k)
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Chris Mundy
Member
Username: chris_mundy

Post Number: 10
Registered: 09-2007
Posted on Thursday, March 13, 2008 - 08:11 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Matt, If my memory serves me correct all P55s have that hole in the bottom of the crankcase casting... if you look closely it doesent actually lead to the inside of the crankcase, it is just a part of the external casting. The two halves of the bottom of the crankcase are effectively separated by the centre bearing (rotary valve assembly). The hole only goes into a cavity in the casting, not the crankcase.
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Peter Ogborne
Senior Member
Username: peterogborne

Post Number: 253
Registered: 09-2002


Posted on Thursday, March 13, 2008 - 09:36 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Matt ...if the hole that you are talking about is as Chris describes then you have no problems .....it is part of the casting and does nothing as far as the running of the engine goes.
Lets have your email address and I will send you an image to confirm it.
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matt harrington
Member
Username: matth

Post Number: 13
Registered: 01-2008
Posted on Friday, March 14, 2008 - 05:37 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

my email adress is 03harringtonm@colfox.dorset.sch.uk
cheers for the help guys!
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matt harrington
Member
Username: matth

Post Number: 14
Registered: 01-2008
Posted on Friday, March 14, 2008 - 05:38 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

it just does not look very proffesionaly cut thats all

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