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Re: [Healeys] 100-4 DIESEL

To: allen c miller jr <acmiller@mhcable.com>
Subject: Re: [Healeys] 100-4 DIESEL
From: Chris Dimmock <austin.healey@gmail.com>
Date: Wed, 5 May 2010 00:11:40 +1000
Start with the timing Allen. And use the best (highest octane) fuel  
Karyn can afford.
Chris
www.myaustinhealey.com

Sent from my iPhone

On 04/05/2010, at 11:19 PM, "allen c miller jr" <acmiller@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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