Don't think that it is over pressurisation per se that is the problem. More the massive pulsing of the pressure due to the sheer size of the pistons. I've got a catch tank fitted which the vent that normally feeds into the inlet between the filter and butterfly is routed to. I'm still getting oil mist out of the breather on the catch tank despite fitting a 2.5mm restrictor in the line to it similar to the standard arrangement and filling the tank with explosafe foam. Might need to fit a catch tank to the catch tank... At least it has stopped drooling oil down the front of the engine from the air filter. One dribbbling idiot per three wheeler is more than enough!
Had a quick look for Monza type caps and could only find them with imperial threads. Far as I can tell the filler throat has a 50x2mm thread (I will happily stand corrected if there is someone out there who is better than me with the thread gauges) so an adaptor would be needed or some drastic surgery to the tank. Think I've lost interest in making a Monza cap fit but will change the nitrile gasket for a Viton one when I get round to it. Looks like I have just saved about £130 which can be better spent on some decent . Every cloud and all that...
Last edited by RedThree; 03/07/1505:44 PM. Reason: typos
They all fit over an internal thread, so fitting to the M3W tank may not be straight forward. You may need to fit oneof their flanged collars over the spigot on the tank.
They are only a few miles away from MWS, who do the Morgan spoked wheels.
Do you remember those lovely Monza caps for the Bonneville that Jenks Bolts sold?
Jays Former Morgan owner. Gone but hopefully not forgotten!
I modified my cars oil filer cap after this problem was reported on TM some time ago. On checking the seal it was found to be almost falling out so I drilled the centre of the cap and bolted a 40mm diameter washer inside to secure the seal and just leave the edge doing its job. It's a stiff nut inside, with Loctite and deformed threads, I don't want it to fall off inside the tank! I think this is similar to what other people have done but some photos explain it better. A cheap fix to a potentially expensive problem. Not sure how easy this is to do to the early tanks with a dipstick. Thanks andymot and others for drawing attention to this. Viewing TM for this sort of warning of problems is essential to M3W ownership IMHO.
This is what i want to make. a lip washer/ flange. it will increase the surface area of the cap's rubber on the tube. (it also needs a nitrile rubber o-ring around the lip washer/flange.)
With just a penny wahser, the pressure in the sheet is still high enough to slice the rubber sheet. The flange spreads the load on the rubber sheet.
The rubber o-ring forms the seal on the other side of the flange.
with this design; both rubber seals can have a very high force. With no risk of breaking into the oil. With a tightly placed cap, no oil leaks.
They all fit over an internal thread, so fitting to the M3W tank may not be straight forward. You may need to fit oneof their flanged collars over the spigot on the tank.
They are only a few miles away from MWS, who do the Morgan spoked wheels.
Do you remember those lovely Monza caps for the Bonneville that Jenks Bolts sold?
I certainly do! Good sellers, both chrome and polished aluminium. Jenks Bolts was good fun, I met a lot of really great people. In many ways the New Bonneville community was similar to the Talk Morgan one.
Peter, 66, 2016 Porsche Boxster S No longer driving Tarka, the 2014 Plus 8...
I modified my cars oil filer cap after this problem was reported on TM some time ago. On checking the seal it was found to be almost falling out so I drilled the centre of the cap and bolted a 40mm diameter washer inside to secure the seal and just leave the edge doing its job. It's a stiff nut inside, with Loctite and deformed threads, I don't want it to fall off inside the tank! I think this is similar to what other people have done but some photos explain it better. A cheap fix to a potentially expensive problem. Not sure how easy this is to do to the early tanks with a dipstick. Thanks andymot and others for drawing attention to this. Viewing TM for this sort of warning of problems is essential to M3W ownership IMHO.
Thanks Planenut, Looks to me that your simple solution is perfect. Even with the dipstick this can work if you use a very long bolt the length of the dipstick. Can't understand why MMC don't do it this way
. Every cloud and all that...
