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Ozzie
Joined: 12 Mar 2005 Posts: 4448 Location: Townsville, Qld. Australia
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Posted: Thu May 29, 2014 2:54 pm Post subject: CIS Rebuild |
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Erratic Idle, Injectors spraying without the engine running, unequal flow from injectors usually means an overhaul is required.
Kits are available to match the part number on the CIS or if you prefer, get the parts individually.
I bought a kit and it comes with different seals for variants and not all are used.
A new metal diaphragm is also included in a kit.
So you have it on the bench and ready to start.
1. remove ‘O’ ring
2. straighten lock tab and undo 19mm nut
3. check orientation of notch in piston housing
4. undo 8 screws
5. separate gently the two halves,
*do not twist, use any levers or damage the mating surfaces, a few light taps on the outside with a hammer should be all that is needed.
You should now be at this stage.
Pull off the centre cylinder and remove the piston if it has not already been removed.
There are 6 ‘O’ rings here to be replaced, check the small fuel filter and remove and clean if necessary.
Check movement of piston in the cylinder and very lightly sand if necessary.
There is an ‘O’ ring in the base, a bit tricky this one.
And one final ‘O’ ring in the pressure relief valve (may be different for USA models)
Shims may be needed to adjust system pressure later.
System pressure should be between 65-75 psi.
Insert the piston back in the top section, using plenty of lube, wd40 or oil, aligning the mark with one of the outlets.
Fit the new diaphragm and reassemble.
There you have it, a lot simpler to do than expected; on a scale of 1-10 I’d give it a 5. _________________ Porsche 924 1984 (UK import) NA
Its AUTO and its BLACK
Montego Black on black/red
Engineer of Electro/Mechanical Systems Maintenance |
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Ozzie
Joined: 12 Mar 2005 Posts: 4448 Location: Townsville, Qld. Australia
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Posted: Thu May 29, 2014 3:10 pm Post subject: |
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Result after setting the a/f mix -
smooth idle, easy start, no misfire, pulls well.
I think this is the best it has run since I bought it.
Still have a hot start problem but can live with that. _________________ Porsche 924 1984 (UK import) NA
Its AUTO and its BLACK
Montego Black on black/red
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Rasta Monsta
Joined: 12 Jul 2006 Posts: 11724 Location: PacNW
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Posted: Fri May 30, 2014 12:50 am Post subject: |
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Wow, good work. I haven't tried it, but I understand these can be a bear to reseal. _________________ Toofah King Bad
- WeiBe (1987 924S 2.5t) - 931 S3
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Ozzie
Joined: 12 Mar 2005 Posts: 4448 Location: Townsville, Qld. Australia
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Posted: Fri May 30, 2014 6:54 am Post subject: |
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maybe a fluke but haven't had any problems.
Make sure everything is clean especially the mating surfaces. _________________ Porsche 924 1984 (UK import) NA
Its AUTO and its BLACK
Montego Black on black/red
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musicalannette
Joined: 21 Feb 2012 Posts: 413 Location: UK
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Posted: Sat May 31, 2014 10:41 pm Post subject: |
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Would you recommend scotchbrite as a surface cleaner if its needed? _________________ I KNEW white wall tyres were invented by Americans .....just not at Boeing.... to be fitted on the 737..... |
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Ozzie
Joined: 12 Mar 2005 Posts: 4448 Location: Townsville, Qld. Australia
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Posted: Sun Jun 01, 2014 9:33 pm Post subject: |
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probably 1200 wet and dry. _________________ Porsche 924 1984 (UK import) NA
Its AUTO and its BLACK
Montego Black on black/red
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MikeJinCO
Joined: 08 Jun 2010 Posts: 1228 Location: Maysville, Colorado
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Posted: Mon Jun 02, 2014 11:26 pm Post subject: |
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If you're going to use 1200 paper. Way back when we had to repair industrial piston type air compressor valves(called reed valves I think) the technique was to put the paper on a sheet of plate glass. then take the valve part with a little oil on it and sand it using a figure 8 motion. The figure 8 motion tends to equalize all the little natural pressure variations from pushing it around. I'd practice first using some Prussian Blue on a chunk of steel. It was pretty tricky to do correctly, but got a surface better than a surface grinder.
This really dates me. _________________ Mike
'67 MG Midget Dp
'71 Ocelot Dsr Kawasaki 1000(under rebuild) |
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Ozzie
Joined: 12 Mar 2005 Posts: 4448 Location: Townsville, Qld. Australia
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Posted: Tue Jun 03, 2014 9:44 am Post subject: |
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Yes- definitely the best way _________________ Porsche 924 1984 (UK import) NA
Its AUTO and its BLACK
Montego Black on black/red
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