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#1
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WUR lower chamber investigation...
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#2
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Quote:
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#3
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So I'm not the only one befuddled by the vacuum hoses on the M110
![]() One goes to the under side of the intake manifold on the back (closest to the firewall). I marked this one "to manifold" on the picture. The other, can be vented to the atmosphere (as far as I understand). On my car it was connected to one of the hoses under the idle air adjustment screw. The one that goes to the intake manifold is the important one. If it is disconnected, you will run rich. |
#4
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Thanks for posting the pics. I´ve been meaning to replace the cracked hose to manifold for a while on my M110 and you just reminded me.
Do you know the inside hose diameter / outside fitting diameter? As I understand it, once the engine is at op temp the WUR has no function, so is it possible that this is not the source of your rich running?
__________________
![]() Don't Chrome them; polish them |
#5
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Between the electrical plug and the word Germany is a circle. This is a pin that holds the bimetallic strip / heater. Tapping this is a slight bit will richen the fuel mixture, someone may have done this to fix a cold start issue. The circle can be drilled / tapped and a jack bolt / washer installed to pull things lean while assembled.
From what I've found taking one of these apart before, the regulator control surfaces are finely ground. Wear causes these surfaces not to seal reducing pressure / making for a rich mixture. The soft gasket is likely silicone. ( molded not formed in place from a tube ) |
#6
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#7
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It turned out it was a much more deceiving problem: The top of the surface where the fuel distributor attaches was bent downwards, causing the control plunger to be slightly depressed when installed. Adding some copper shims around the screws under the fuel distributor fixed the problem. |
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