[Healeys] 100-4 DIESEL

Alan Seigrist healey.nut at gmail.com
Tue May 4 16:01:58 MDT 2010


Allen -

You'd have to shave a lot off the 100 block to get that much
dieseling.  Unlikely but check compression, if up around 180+ or so,
then the block is shaved.

I'd focus on spark, something is keeping the coil on I think.

Alan

On 5/4/10, allen c miller jr <acmiller at mhcable.com> wrote:
> I am helping a friend who just bought a 100 sort out a few issues with
> SEVERE
> dieseling and a sticking throttle. Her car is a BN1 converted to BN2
> 4-speed,
> and the prior owner mounted a 100-6 top-pedal box to accomodate a hydraulic
> clutch (presumably a BN4 bellhousing).
>
> the throttle linkage was sticking rather severely because the rear brass
> ball
> joint casing was hanging up on the original asbestos shielding (the pedal
> pivot is at the top, and obviously displaces the horizontal linkage a little
> downward). we've cut away enough of the shielding to eliminate this
> obstruction, and can set the idle down to 700-800. i had hoped this would
> kill
> off the dieseling, but does not. nor does lifting up on the pedal with your
> toes to assure the throttle is fully back.
>
> the dieseling is really bad. you have to engage in 4th and the car wants to
> drive forward, even when not engine temp is not very high. I have read past
> threads, and noted several 'usual suspects'...
>
> 1. idle speed (not a problem here)
> 2. choke cable adjustment
> 3. leaking throttle plate shafts
> 4. timing
> 5. too high compression
> 6. carbon buildup
>
> is there an order in which i should check these to rule out contributing
> factors? are there any other causes of dieseling you've encountered.
>
> the engine runs vigorously and has great throttle response. by history from
> the seller, there was an engine build in the 1970's by his P.O., but we
> don't
> know if the head was shaved more than appropriate. if it is a compression
> issue, would using a tank of CAM2 prove/disprove compression as contributing
> to the dieseling? if it is, can the problem be solved with having a steel
> shim
> made to the shape of a head gasket? are the Dennis Welch steel gaskets
> thicker
> so we could lower compression should that be the issue? there is no leakage
> out the side by the motor number plate, so I don't see a need for one
> otherwise.
>
> allen miller
> bn2/m
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-- 
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Alan

'52 A90
'53 BN1
'59 Jag Mk IX
'64 BJ8


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