|
|
|
|
|
#1
11-19-2006, 09:48 PM
|
||||
|
||||
|
MFI Pump Solenoid wiring on M129
On the MFI pump on my M129 engine, I have a small 2 wire harness going to the solenoid. 1 wire is connected to the solenoid, one OE black wire with a ring connector is dangling in space and looks to me like it should be connected.
Questions: 1) Does anyone know how this solenoid should be wired? 2) Can the solenoid be removed to see if all the hookups are there? Many thanks.
__________________
Present 1971 280SE W108 1967 250SE W111 Rhode Island _____________ Auf Wiedersehen 1972 280SE 4.5 (AKA Das Moneypitten) 1972 250C (Mit den zwei carburetors from hell) "Time fly’s like an arrow, fruit flies like a banana" Groucho Marx 
|
|
#2
11-20-2006, 01:13 AM
|
|||
|
|||
|
If there are two screw terminals on the sol., the wire goes to the vacant one....but , there was a mid year change on R-18 pumps, where the later version used a sol with a case interior ground circuit. On this sytem, the ground wire is not used as the case itself is grounded. You can tell that one b/c there is only one screw terminal. The other is just a blank terminal [ with no way to hook wire to it].
You can tell if it is working by feeling the sol while someone cranks the starter.. you will feel it snap in .. it pulls the rack to full full rich position when the starter is cranked for start aid. If the sol or pump was ever changed , it may now have the later style , so that wire is not needed now.......check the trerminals on sol and you will know.
|
|
#3
11-20-2006, 09:02 AM
|
|||
|
|||
|
The injection pump on my 68 280SE has two solenoids. The top one is the starting solenoid and the bottom one is the fuel shut off solenoid. Pumps after 1970 did not have the starting solenoid because of improved check valves in the injection pump and a revised cold start valve that injects more fuel at start up. Here is a link to the later and earlier pumps.
http://www.sl113.org/forums/uploaded/ja17/2006760399_injection%20pump%20sol.JPG The injection pump on your 67 should have two solenoids and should look like the injection pump on the right in the picture above. Hope this helps John
|
|
#4
11-20-2006, 09:26 AM
|
|||
|
|||
|
<
Stop magnet sol did not come out until pump R18y, and on USA version only. Pump shown is R18, which does not have a stop magnet , regardless of Euro or USA version chassis w/129 engine. 130 engined chassis [ 280se ] have a completely different pump which has force feed crankcase lubrication, whereas the 129 engines [250] all used the seperate/self contained oil res. with dip-stick. Your 280se would be the later style pump w/force feed lube, no dip-stick or oil fill cap [ R20 and beyond, starting in 1968] Last edited by Arthur Dalton; 11-20-2006 at 09:35 AM.
|
|
#5
11-20-2006, 04:02 PM
|
|||
|
|||
|
I didn't know the earlier pumps didn't didnt have the stop solenoid. I learn something new about the MFI systems on these cars all the time. Thanks
|
|
#6
11-20-2006, 06:29 PM
|
|||
|
|||
|
The stop sol was a USA only early Emissions addition. [ decelleration device]
Most guys just disconnect them. These MFI units are great little pumps.. the trick on the early ones is to watch the oil level with the dip-stick. I have done some that the owner did not even know there was a res. for the pump. The later ones are crankcase fed , but I prefer the res b/c you are not using dirty crankcase oil for lube and crank fumes tend to carry moisture . Common problem is freeze-up on later pumps in cold climates due to moisture from oil feed. Frequent oil changes are the remedy.
|
|
#7
11-20-2006, 07:57 PM
|
||||
|
||||
|
To clarify, my 1967 250SE W111 coupe is a Euro delivery. Munich, Germany, wholesaled city, ex. factory Aug. 24,1966.
__________________
Present 1971 280SE W108 1967 250SE W111 Rhode Island _____________ Auf Wiedersehen 1972 280SE 4.5 (AKA Das Moneypitten) 1972 250C (Mit den zwei carburetors from hell) "Time fly’s like an arrow, fruit flies like a banana" Groucho Marx
|
 |
| Bookmarks |
|
|
Linear Mode
