>From what I've heard, if the cylinder is scored badly then you'll
certainly need to have the cylinders redone, with the possibility of
needing oversize pistons. Ouch, that is an ugly and expensive prospect.
Looks like you are better off looking for another block. Definitely look
for a complete running engine. That's got to be the easiest way to go.
You might want to give Mike Kerr a call.
Fred
________________________ Reply Separator ___________________________
>Subject: RE: Blown engine
>Author: "Sochoux; Stephan" <SSochoux@dbc.com>
>Date: 10/12/99 10:41 AM
>
>Fred,
>The front of the piston was just blown to pieces, intake port on #3 and
>rear carb throat are coated with tiny little fragments. Looking down the
>cylinder, the wall is scored and already completely rusted out. I don't
>know how to tell if the block can be saved, but it sure looks ugly to me.
>I'll be saving that piston !
>I'll have some pics soon.
>
>Stephan.
>
>> -----Original Message-----
>> From: Fred_Katz@ci.sf.ca.us [mailto:Fred_Katz@ci.sf.ca.us]
>> Sent: Tuesday, October 12, 1999 9:54 AM
>> To: datsun-roadsters@autox.team.net; Sochoux; Stephan
>> Subject: Re: Blown engine
>>
>> Stephan,
>>
>> Wow, bad news! The engine isn't necessarily trashed. It just
>> depends on how much cash you have sitting around! I think you're on
>> the right track
>> - get another runner or engine, as your '69 U20 will take a while to
>> repair. If you tear down the engine, don't throw away the piston as
>> it'll be something everyone else will want to see.
>>
>> When you say vaporized, do you mean "melted" or do you mean
>> fragmented?
>> If it's the front of the piston, that's where the intake valve is, so
>> it's possible that something got pulled in. Maybe one of your rings
>> broke and took the piston top out. That's the only way I
>> could see the hex screw head causing problems, if it got squished and
>> the metal jammed
>> the rings. When I cleaned up my pistons, I found some metal jammed in
>> one of the ring landings, so I know it happens. You should
>> drop the oil
>> pan, and pop out that piston so you can inspect the condition
>> of the #3 cylinder. If you didn't get any metal fragments dropping
>> below the piston, and #3 cylinder isn't damaged, it may be possible
>> to re-hone the
>> cylinder and put in a new piston without pulling the engine. But get
>> second opinions on this, as you will be better off going the whole
>> distance by a complete teardown. Let me know what you need as
>> I have the tools.
>>
>> Fred
>>
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