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t140e forks and oil pressure

t140e forks and oil pressure

Postby mudplugger » Sat Mar 18, 2017 6:35 am

I have finally finished my Rickman Metisse, photos to follow soon. 2 things on commissioning have cropped up.

firstly, on kicking it over for the first start the oil pressure went up to 60+ psi, on starting, stopping and starting again it settled at 20psi and seemed to drop on revving, the oil return was, and still is, impressive coming back into the frame return, I am going to connect a spare gauge and try to eliminate the new one having a fault, also for a brief period after about 5 mins both exhaust were emitting a lot of white smoke, oil I am thinking, this seemed to clear after restart a bit later. the engine has had a full rebuild, re ground crank, new pistons and rings, honed barrel, all new bearings and seals etc,

secondly, the forks have been re built with new seals, new stanchions, I am sure new springs as well. After compressing, they don't return to full height, I have to pull them back up to full height. I have loosened off the front wheel, bounced about and tightened clamps.
I don't seem to have any bits left over, but it seems that a spacer or something has been missed on my part.

Any suggestions welcome please, deflated at the moment after so many hours, weeks and months and plenty of frustration, but I have really enjoyed the whole process and learnt so much, just need that final bit sorted, thanks Neil.
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Re: t140e forks and oil pressure

Postby L.A.B. » Sat Mar 18, 2017 12:59 pm

mudplugger wrote:firstly, on kicking it over for the first start the oil pressure went up to 60+ psi, on starting, stopping and starting again it settled at 20psi and seemed to drop on revving,


Three possible causes of a sudden drop in oil pressure can be due to the crankshaft oil seal inverting (lip turns inside out), the OPRV could have stuck open, or a small piece of dirt or metal swarf stuck under the feed pump ball valve.



mudplugger wrote: the oil return was, and still is, impressive coming back into the frame return,



If the crank seal does become inverted, then a certain percentage of oil will go straight to the sump without passing through the crankshaft so you would still see a good return flow, however, this is just one possibility.





mudplugger wrote:secondly, the forks have been re built with new seals, new stanchions, I am sure new springs as well.



Who rebuilt the forks? You might be sure they are new springs but are you sure they are the correct springs?


mudplugger wrote: After compressing, they don't return to full height, I have to pull them back up to full height. I have loosened off the front wheel, bounced about and tightened clamps.
I don't seem to have any bits left over, but it seems that a spacer or something has been missed on my part.


There's no spacer in the standard T140 fork.
A couple of suggestions.

The damper O-rings (97-4003) can be the cause of a 'sticky' fork action. There are better phenolic replacements for the standard O-rings.

Which type of fork seals?
If they are the original '78-on 'self-aligning' or 'leak-proof' type with interference-fit metal 'retainers' (like a large washer above the seal) then the retainers must be fitted so there is a gap below the retainer so the seal is free to 'float'. If the retainers are pressed down hard against the seals it can cause the forks to stick.
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Re: t140e forks and oil pressure

Postby Triton Thrasher » Sun Mar 19, 2017 5:31 am

People have also been known to fit the crank oil seal backwards.

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Re: t140e forks and oil pressure

Postby mudplugger » Mon Mar 20, 2017 6:48 am

Thanks for the info, I did all the rebuilding, so could have easily made a silly error, at least I now have some places to start looking. will let you know how I get on.
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68 Daytona T100T
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94 Triumph Speed triple mk1
79 t140 project
plus random others
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Re: t140e forks and oil pressure

Postby auldblue » Mon Mar 20, 2017 4:44 pm

That's a bit of a bugger but you'll get it sorted out I'm sure. It's just frustrating after all the work. Good luck.

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