It looks tight but....................
Discussion
I'm fairly sure you do, but someone may come along to say different.
But.... If you are painting the rocker cover you don't want things too tight or you'll likely scratch it when refitting it.
Also, removing the plenum gives an ideal opportunity to clean / paint more parts and fit it back on with a set of shiney stainless bolts!
But.... If you are painting the rocker cover you don't want things too tight or you'll likely scratch it when refitting it.
Also, removing the plenum gives an ideal opportunity to clean / paint more parts and fit it back on with a set of shiney stainless bolts!
JMF894 said:
Can someone confirm that in order to remove the nearside rocker cover I will have to lift the plenum?
Cheers Jimbo
Sorta...but fortunately not completely. Remove the air conduit and the screws and push the plenum nose up a bit. You will be able to wiggle the cover off without further ado. However, you must be careful putting it back on its gasket. (are you using the old cork gaskets or the new silicone ones?)Cheers Jimbo
If you have the plenum removed it is an ideal opportunity to deal with several local issues that may affect performance and drivability.
0 Ream out the crystalised carbon crud from both the idle air and breather galleries,
0 Check over all the air pipes and other miscellania connected to the plenum for spllts and poor sealing,
0 Fettle the throttle mechanism, levers, disc, etc for best posible fit n' function to eliminate any friction thereabouts and the possibility of "Idle speed hang-up",
0 Check out the trumpets for loose fit and clean out the crud,
o Remove the throttle pot, check it out electrically and ensure it rotates smoothly in harmony with the throttle spindle,
0 Upon reassembly, ensure the throttle disc is dead centre in the tunnel to avoid binding when closed,
0 If you have a throttle stop adjustment screw, set the gap between disc and tunnel to between 0.002” and 0.005” depending on how much wear is present and how low the idle speed can be adjusted using the adjustment screw,
o Ensure you get a full 90 degrees rotation of the throttle disc when the pedal is fully depressed,
0 Ensure the metal to metal seal between the plenum and the trumpet housing is perfectly flat, clean, free from crud and old silicon goo, then, upon reassembly, use only the merest trace of silicon gasket sealant on the mating faces (some owner/enthusiasts use nothing as per the original factory practise, but it depends upon their condition and your best judgement).
0 Before re-assembly, inspect all the exposed fuel pipes for condition and fitness for purpose.
0 Likewise the injector assemblies and local inlet manifold seals.
0 Perhaps even take the opportunity to clean, inspect and service the injectors treating them to new filter baskets, pintle caps, stub fuel pipes and local fuel lines.
There's loads of reading material available. "Look after your Plenum and your Plenum will look after You!" YKIMS
0 Ream out the crystalised carbon crud from both the idle air and breather galleries,
0 Check over all the air pipes and other miscellania connected to the plenum for spllts and poor sealing,
0 Fettle the throttle mechanism, levers, disc, etc for best posible fit n' function to eliminate any friction thereabouts and the possibility of "Idle speed hang-up",
0 Check out the trumpets for loose fit and clean out the crud,
o Remove the throttle pot, check it out electrically and ensure it rotates smoothly in harmony with the throttle spindle,
0 Upon reassembly, ensure the throttle disc is dead centre in the tunnel to avoid binding when closed,
0 If you have a throttle stop adjustment screw, set the gap between disc and tunnel to between 0.002” and 0.005” depending on how much wear is present and how low the idle speed can be adjusted using the adjustment screw,
o Ensure you get a full 90 degrees rotation of the throttle disc when the pedal is fully depressed,
0 Ensure the metal to metal seal between the plenum and the trumpet housing is perfectly flat, clean, free from crud and old silicon goo, then, upon reassembly, use only the merest trace of silicon gasket sealant on the mating faces (some owner/enthusiasts use nothing as per the original factory practise, but it depends upon their condition and your best judgement).
0 Before re-assembly, inspect all the exposed fuel pipes for condition and fitness for purpose.
0 Likewise the injector assemblies and local inlet manifold seals.
0 Perhaps even take the opportunity to clean, inspect and service the injectors treating them to new filter baskets, pintle caps, stub fuel pipes and local fuel lines.
There's loads of reading material available. "Look after your Plenum and your Plenum will look after You!" YKIMS
Well yes indeed it's the proverbial 'can of worm' syndrome. Once started where to stop? This is why this will be a Winter project for me so I can take my time and do it properly. Whilst I'm in there does anyone know the dimensions of the trumpets on a 450? I want to check if they are standard.
Jimbo
Jimbo
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