Pagoda SL Group
W113 Pagoda SL Group => Drive train, fuel, suspension, steering & brakes => Topic started by: alchemist on September 14, 2024, 20:40:46
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Hello: I am posting a puzzling issue on 1974 280SL, R107, European version with M110 engine. I know this post is not within the scope of Pagoda's group, however, I could not find any literature covers this engine. I though that someone at the pagoda's group might be familiar with this engine.
The issue is that no vacuum at the distributor at idle. If you see pic, I marked 3 points at the intake manifold. I have full vacuum at points 1 & 2 but not at point 3 which is the venturi area. There is a rubber hose connect point 3 to the distributor. I cleaned the venturi and made sure that port 3 is fully open. The puzzle is why there is vacuum at points 1 & 2 but not 3, knowing the fact that port 3 is a part of the intake manifold and it should have vacuum when the butterfly if fully closed. The car runs and idle well even with no vacuum at idle.
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It should have vacuum at either closed or open throttle, not both. If it doesn't have vacuum at any throttle position then the port is blocked.
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Do you have vacuum to the distributor when you open the throttle? Maybe the distributor is a vacuum advance rather than vacuum retrard type.
Cheers,
CT
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The distributor is connected to port #3 with a hose, eliminating distributor's advance/retard option. I measured at port 3 after clean it and found no vacuum. If I open the throttle, the RPM goes higher indicating that there is no blockage and there is a flow of air. It is a puzzle.
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When I measure at port 3, eliminating the distributor by disconnecting the vacuum hose, there is no vacuum at idle. When I open the butterfly, the RPM increases and still no vacuum. It is a mystery. The intake manifold I have on M110 engine is very similar to the Pagoda's 280SL by design. The vacuum system should work as the same as the Pagoda. I re-routed the distributor hose to connect to port 2. So, currently, the distributor has vacuum, but from a different port.
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What model M110 engine is it? I have the big M110 manual with vacuum diagrams. Maybe one of them will shed some light.
CT
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Hi Chuck:
My M110 engine is in R107 1974, it is rare and it's model is 280 SL. It does not have a vacuum diaphragm like diesel engines. The vacuum is generated by the intake valves very similar to the pagoda's 280 SL. Thank you for your contribution.
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I do have a service manual for M110, vol. 1, but it does not cover the European injection and intake manifold. It covers the USA versions only.
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When Chuck asks what type of M110 it is, I believe he's asking about more of the engine number. See my screenshot from M110 wiki page.
https://en.m.wikipedia.org/wiki/Mercedes-Benz_M110_engine
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Going by application, it looks like one of these two.
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Ooooo, aaaaa! This is the one to find if you're looking to upgrade your Pagoda. 156 kW (212 PS; 209 hp) and 255 N⋅m (188 lb⋅ft).
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So if it's a 1974 car, it would have D-jet (electronic) injection, correct?
CT