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Old 04-17-2009, 05:25 PM
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Join Date: Aug 2007
Location: Middle Haddam, CT
Posts: 315
oily trigger points (again)

I finally got around to totally disassembling my spare D jetronic trigger point distributor looking for inner shaft seals as a possible cause of oil getting on the trigger points. Short answer: there are none. There are only a series of very thin steel and fiber washers to ensure proper wear protection at contact points. That's not to say that the shaft is not well designed to thwart excess oil creeping up the shaft to the trigger points. the inner shaft has a sleeve about 1 1/2 inches long that fits with close tolerances over an elongated recieving bushing in the lower part of the distributor housing (where the trigger points are) that would make it very difficult for oil to seep through in the absence of excess (and unnatural) crankcase pressure. In other words, if you have a new outer shaft seal, and your inner shaft bushes are not worn out (which is not too likely given their hefty dimensions), the probable cause of frequently oiled trigger points pretty much has to be excess crankcase back pressure. As Quicksilver noted on my last trigger points thread, be sure the little mesh "filters" on each of the valve cover breathers is clean and that the PVC valve is clean and operating properly. Check the breather hoses too.

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Berfinroy in CT
Present vehicles:
1973 300 SEL 4.5
1959 Rolls Royce Silver Cloud I
1959 Ford Thunderbird convertible/430
Past vehicles;
1958 Bentley S 1
1976 ex-Max Hoffman 6.9
1970 300SEL 2.8
1958 Jaguar MK IX
1961 Jaguar MK IX
1963 Jaguar E-type factory special roadster
1948 Plymouth woody
1955 Morgan plus 4
1966 Shelby GT350H Mustang

Last edited by berfinroy; 04-18-2009 at 09:29 AM.
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