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Distributor, oil metering jet
Posted: Tue Sep 20, 2022 10:13 pm
by egr
The 1955 AJS model 20 was fitted with a metering jet to replace the camshaft driven oil distributor. Can anyone help me with the size of the hole in the jet as my bike only has a hole where the jet should be.
Re: Distributor, oil metering jet
Posted: Tue Sep 20, 2022 11:39 pm
by dave16mct
I don't know what size the jet should be but why not fit a distributor bush? I had a 1955 model 20 and that had the distributor bush.
Dave.
Re: Distributor, oil metering jet
Posted: Thu Sep 22, 2022 6:18 pm
by egr
Thank you for your reply. Unfortunately, there is no drive lug on the end of the camshaft and the casing only has a 2BA screw hole to the end of the camshaft. This would indicate that this engine is designed to have a metering jet.
Perhaps unlucky to have one of the few engines built this way!
Re: Distributor, oil metering jet
Posted: Thu Sep 22, 2022 6:21 pm
by egr
Further to my last entry the Metering Jet has part No. 022101
I've looked all over for one without any luck.
Re: Distributor, oil metering jet
Posted: Thu Sep 22, 2022 8:09 pm
by Andy.S
club spares has metering jets listed as 018890 any good ?
Re: Distributor, oil metering jet
Posted: Fri Sep 23, 2022 6:05 pm
by egr
Thanks for your reply, Andy. Unfortunately, those jets are installed in the cylinder heads to meter the oil to the rockers.
Re: Distributor, oil metering jet
Posted: Sat Sep 24, 2022 11:29 am
by ajsph
the factory send 27-03-56 a service bulletin to the dealers, about the metering jet, they had to remove the jet on all 1955 models, and use the oil distributor, no 022385 and the cap 014247 and washer 011642.you say there is no tang on the exhaust cam only a 2 ba hole, the oil distributor has a 2ba hole, maybe what you see, is the end of the distributor and not the camshaft, screw a bolt in the the hole, and try to pull the distributor out.
Poul
Re: Distributor, oil metering jet
Posted: Sat Sep 24, 2022 1:40 pm
by egr
Thank you, Poul, for that very useful information. I think it was obvious that the distributer jet was a failure as it was only fitted for a short time.
I am away for a week but when I return, I will have a closer at my engine and report back.
Re: Distributor, oil metering jet
Posted: Mon Oct 03, 2022 12:49 pm
by egr
Poul, thank you for your information and you were quite right the 2BA hole was the end of the distributor which came out easy.
The distributor is badly scored as is the recess which show signs of the engine running with dirty oil in the past.
I have ordered a new distributor from Dragonfly.
Thank you again, as it was not what I was expecting to see when I removed the end cap. Problem solved!!