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How to avoid an engine fire or a meltdown....

To: datsun-roadsters@autox.team.net
Subject: How to avoid an engine fire or a meltdown....
From: Rob Simmons <rsimmons2@shaw.ca>
Date: Tue, 28 Feb 2006 09:26:49 -0600
Hi List,
I am sending this to the list asking for any help that I can get.
First of all, I am the "buddy" with the half assembled car, and the
lack of mechanical skills.  Ray (the em author) has been helping me
assemble the car.  Let me re-phrase that ... he has been doing the work
while I helped as a mechanic's helper handing him tools and holding the
light in his eyes :-)
This was posted on 311 and it was suggested the timing might be out
180, and or the valves not adjusted properly.  We're going to give
another try this evening, so I would like to get all the ducks in line
as they say before then.  Thanks to those who replied on 311 we are
going to try all the ideas.  I'll post a progress report in the
future....

Rob

Does anyone have some suggestions of things to check or re-check to
prevent an engine compartment fire during start up?

Ive been helping a buddy put back together a roadster that he received
in a partially restored condition.
The U20 engine and head was supposedly rebuilt by the previous owner
and had not been started and run prior to my buddy getting the car.

Finally, after going thru the engine compartment to complete the
wiring, convert the alternator over to the cool side, installing the
intake manifold/carbs, and sorting out the cooling system, we rolled
out the car to be started.

When the engine was turned over, there was raw gas vapour being
backfired out of the carbs during some of the engine strokes.
After turning the engine over several times, we aborted the starting
attempt for fear of igniting the vapours.
The plugs have spark, but luckily there was no detonation during
turnover to start a fire during gas vapour backfire thru the carbs.

In preparation for start up, we had checked the firing order ,static
timing and valve clearances, but I think a revisit to these items is
warranted.

Is it possible that the previous owner could have put the timing chains
on wrong and can this condition be checked out without having to pull
the engine and timing cover?

What else should I check for which could cause bad things to happen
upon next attempt of start up?

All suggestions and advice would be appreciated!

Thanks
Ray B.




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