Before you buy a new engine, talk to a machine shop and see what the cost of
RESLEEVING the cylinder would cost, as well as rebuilding the engine.
-----Original Message-----
From: Sochoux, Stephan <SSochoux@dbc.com>
To: datsun-roadsters@autox.team.net <datsun-roadsters@autox.team.net>
Date: Tuesday, October 12, 1999 8:18 AM
Subject: Blown engine
>A little update on my latest "breakdown":
>
>Pulled the head off last night, front 1/4 of piston #3 is vaporized ! Head
>looks fine though. Any clues to look for to determine the cause ?
>I did notice that the head of the hex screw on the throttle shaft holding
>the butterfly (rear carb) was sheared off. Why that would happen is a
>mystery by itself, but would such a tiny head screw crumble a piston if
>sucked in ?
>Anyway, i'm looking to buy a U20 engine or possibly a low windshield 2000
>project car (running) while i pull the motor out. I think it's trashed.
>
>Thanks-
>
>Stephan.
>
>>
>> Howdy,
>>
>> I think i' ve paid my dues to the roadster God. In the last
>> 6000 miles, my roadster has seen two 5th gear neutrals, new
>> chains, new 1/2 rear main seal and a rebuilt head (due to a
>> dropped valve seat). Also, falling in the minor category, new
>> recored radiator, complete brake job, wheel bearings, starter
>> and master/slave cylinder. I'm sure i'm forgetting something
>> here. Why mention all this ? Well, while driving home last
>> night, i heard a horrible metallic rumble coming from under
>> the hood while on the 92W 101S connector. The roadster stalls
>> immediately and i'm stuck on the connector while cars fly by
>> me. Luckily, the connector is sloping down so i manage to
>> coast to an open spot, safe from all the crazed commuters. No
>> visible damage under the hood but since i don't have my tool
>> box i can't wrench anything. After waiting 2 hours for a tow,
>> i'm back home ready to start investigating. I pull the cam
>> cover and don't see anything wrong. The engine turns manually
>> but not a complete cycle. I pull the spark plugs one by one
>> and #3 is soaked wet. With a flash light, i peek in there and
>> Oh NO, i see little chunks ! Looks like another dropped valve
>> seat ? broken rings ? More to come when i take it apart.
>> Is this just bad luck or what ? Why causes the valve seats to
>> drop ? Anyone else with this problem ? Maybe i'll get them
>> all welded if it turns out to be the problem.
>> Who has put 50K or 100K trouble free miles on a roadster ?
>>
>> Stephan
>> '69 2000 BADROC
>>
>
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