Hi list,
one of the welsh plugs on my 240z is leaking, its the one on the pasanger side closest to the firewall so it is farely easy to access, are these easy to change or should i get someone who knows what they are doing to do it?
Not difficult to do, but if your not sure perhaps get someone to
help who has.
This is the procedure I've used with success: using a suitable
drift, tap on one edge of the welsh plug to eventually push it in
(that's right _in_) and you can rotate the plug 90 deg (so that an
edge is facing out of the block), then grab the edge of the plug with
a pair of multi-grips and lever the thing out. Don't worry if
you knock the whole plug into the block, it can't go far.....
Putting the new plug in is just a matter of making sure all
mating surfaces are clean (esp in the block), smearing the edge of the
plug with some silcone sealer (_small_ amount), then tapping the thing
in place using something like a socket that closely matches the ID of
the plug. Try to keep the thing as square as possible.
Few other things to think about:
1. if one plug is leaking the rest will be in a similar
condition, or close to it.....so perhaps do them all (??)
2. use brass welsh plugs as replacements - the ones on the side
of the block are 35mm OD, from memory.
3. it will probably be easist to remove all the manifolding to
get to the plug (I'm assuming a RHD car here). It is _very_
common to find the rear exhuast manifold stud to be broken, and
sometimes the front as well.....
Also I have the standard twin hitachis on it and was wondering whether it is worth reconditioning them or whether I should just get some webbers? its a pain atm to start as it just keeps dying like its starving for fuel... And just another thing, sometimes you reveal alot of problems when you steam clean your engine :) I've had both heater hoses go on me... maybe this could be a vacuum pipe or something too?
The Hitachi 'SU's' are actually a pretty reliable carb, and not
bad as a performance carb either with the right needles, even on a
'worked' L28 (there are a few examples of 100+ RWkW engines in the
NDSOC using these carbs). Personally I would say that, unless
your engine is highly worked, I would stick with the SU's (of course,
if they are totally knackered that is a different matter, but a
good set of triples is going to set you back around $1000). One
of the problem areas with the Hitachi's is that the throttle shafts
and bushes wear leading to leaks and erratic running, and this can be
expensive to repair.
If the engine hoses are this bad, I'd suggest going over the
thing with a fine toothh comb and even complete replacement (consider
it insurance....)
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