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Post by hudson43 on Jan 16, 2022 13:46:29 GMT
My 1946 new Hudson barn find is smoking really badly and bubbling at the base gasket, also was pushing petrol out of the petrol tank cap….it also runs erratically, seems like the crank seals have gone, has anybody done this job and what is involved !
engine is a Villiers junior deluxe !
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Post by JamesCentral on Jan 16, 2022 14:14:51 GMT
It's not a normal seal; it's a spring loaded bronze bush. The Browning Book [Download] gives a good account of what's involved - The Junior/JDL chapter is page 90 of the book, which is page 46 of the pdf. |
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Post by hudson43 on Jan 16, 2022 15:10:03 GMT
It's not a normal seal; it's a spring loaded bronze bush. The Browning Book [Download] gives a good account of what's involved - The Junior/JDL chapter is page 90 of the book, which is page 46 of the pdf. Thanks jamescentral, that’s really helpful I will have a good read later and get the parts ordered ! |
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Post by davwat on Jan 16, 2022 17:53:06 GMT
My 1946 new Hudson barn find is smoking really badly and bubbling at the base gasket, also was pushing petrol out of the petrol tank cap….it also runs erratically, seems like the crank seals have gone, has anybody done this job and what is involved ! engine is a Villiers junior deluxe ! First There is No way on this earth that a crank seal can push petrol out of the petrol tank! the only time I had that if it's too full (the price of petrol these days that never happens). As JamesC has said it's a bronze seal these require oil to seal, old school was SAE30 at 16:1 so they will smoke, I realise you have said badly what mix are you using. I would only go to crankcase seals after every other avenue has been eliminated, (admittedly not a JDL but I just wasted 2 days on a moped! reasonably spark with plug out of engine, changed carb, changed coil, using a spare tank of fresh fuel nought. Changed condenser and away she goes. Have you cleaned the jet/centre piece, clean it again then clean it again. Did I mention clean the jet/centre piece they can be the cause of erratic running. and last but not least for now, have you adjusted the points and set the timing (not just used the stamping on the flywheel).
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Post by hudson43 on Jan 16, 2022 18:59:02 GMT
I have set the points and set the timing via the mark on the flywheel and tdc, I cleaned the carb really well and jets, I think I need to look again at the jet centre piece tomorrow and will report back, I have rigged the bike to run on an external ignition coil and battery ….condenser is new from villiers services..I am mixing my two stroke at 20 to 1 ratio. Yep I agree the tank was to full and that’s probably why it was bubbling out….thanks for your help dav wat Attachments:
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Post by davwat on Jan 16, 2022 19:33:01 GMT
Your welcome. TBH I have very little experience with with the JDL's and have never stripped one, would hate to think you stripped yours only to find the seal is OK. Just to also mention use mineral oil, synthetic will clean the seal out which does need a bit of gumming up! and best to set the timing with points just opening when piston is 1/4 BTDC, then go back to check the timing mark is correct at TDC (sometimes marks are accurate, but if the flywheel has been mixed and matched in the last 80 years or in some cases points changed the timing mark could be out).
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Post by hudson43 on Jan 16, 2022 19:35:30 GMT
is this the jet centrepiece davwat Attachments:
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Post by hudson43 on Jan 16, 2022 19:48:20 GMT
I will have another look at the timing tomorrow, with a bit of luck hopefully some better progress as I definitely don’t want to strip the engine unnecessarily
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Post by davwat on Jan 16, 2022 20:06:28 GMT
is this the jet centrepiece davwat That is the Jet, the Jet screws into the centre piece, in the old manuals it says never dismantle or it's scrap !!!
But unless you have an ultrasonic cleaner they take some cleaning inside hence the several mentions. Nut sure why they said scrap! but I have undone several to clean them. My tea is ready I will look later or you can look in that Browning book as to the correct size for the JDL.
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Post by hudson43 on Jan 16, 2022 20:19:46 GMT
Thanks davwat, I will have a look at getting it a lot cleaner
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Post by davwat on Jan 17, 2022 14:50:56 GMT
And another thought (look out they can be dangerous!) on the subject of bubbling out of the base gasket have you drained the crankcase? best to do that with a warm engine.
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Post by davwat on Jan 17, 2022 14:57:46 GMT
Going off piste here but anybody date that engine or any info on the number? (my limited knowledge has JDL's as XX or XXA and Roy Bacon's book does not list 586 engines, maybe the S is significant ? .  |
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Post by hudson43 on Jan 17, 2022 16:50:38 GMT
Cleaned the carb and reset the timing, miles better…now on the road and maiden voyage completed this afternoon! thanks for all your help p.s didn’t know about the crankcase drain, thanks davwat Attachments:
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Post by JamesCentral on Jan 17, 2022 22:57:29 GMT
Going off piste here but anybody date that engine or any info on the number? (my limited knowledge has JDL's as XX or XXA and Roy Bacon's book does not list 586 engines, maybe the S is significant ? . The S isn't part of the number, it's a code to show which manufacturer the engine was supplied to. The Carrick/Walker book has a few more numbers than Bacon's but 586 isn't in there either - but 1947-ish. |
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Post by davwat on Jan 18, 2022 8:01:52 GMT
Going off piste here but anybody date that engine or any info on the number? (my limited knowledge has JDL's as XX or XXA and Roy Bacon's book does not list 586 engines, maybe the S is significant ? . The S isn't part of the number, it's a code to show which manufacturer the engine was supplied to. The Carrick/Walker book has a few more numbers than Bacon's but 586 isn't in there either - but 1947-ish. The picture of the engine was on a FB group where the owner was looking to accurately date his New Hudson, I said he would have to do that from the frame number. He is from Australia could the S or 586 be significant there?
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