Marquis petrol tank
Having followed Chris G's post on his rebuild experiences, I note the frustration of said petrol tank and its obtuse fixing bolt. Am I right in assuming the entire fan housing must be removed to access this bolt? Its said a special spanner can be used
There is a bit of rust in the bottom of the tank but I cant tell how important this is
Looking at the tank, are the two halves hard soldered together?
Any advice on how to treat the internals and apply a rust proof coating?
edit
it turns out that removal of the fan cowl is a simple matter of 4 bolts though I am less happy that two of them them are cylinder head bolts. I might convert these into studs with dome nuts. Cylinder head bolts into aluminium castings - alarm bells
Forums
Agree that if there is not
Agree that if there is not much rust and it is not loose / flaking - then it shouldn't be an issue, closer inspection will give you a better idea, you will get the tank off, its not that hard with the right spanner and reassembly is much easier.
Hydrochloric... may differ on this one. Yes it eats solder, and rust of course, it also starts to munch steel and will carry on munching if not processed properly. It must be thoroughly cleaned off and neutralised with hot alkaline detergent and only to be used if sealing a tank afterwards as it will flash rust very quickly. But it is quick and highly effective, I've used it many times as prep for POR15 sealing in fuel injected applications which are far more sensitive to rust.
Ive used phosphoric acid for
Ive used phosphoric acid for cleaning up superficial rust on old tools, nuts and bolts ect. Its not too agressive and passivates the rust rather than eating it away to bare metal. WOW that tank sealant stuff is really expensive, maybe wait till a spare fuel tank comes along. Will see how the tank is when I get it off. As you say , what numpty designed that? Then we wondered why the british car industry fell apart - some good Top Gear vids on reasons why - my pet hate was anything British Leyland
EDIT!!!! Everything I wrote
EDIT!!!! Everything I wrote above relates to Phosphoric NOT Hydrochloric !
Phosphoric is in fact the active ingredient in POR's "metal ready" treatment, thats why I buy it in 5lts at 85% for a fraction of the cost of POR 1ltr metal ready.
The actual POR15 sealer is expensive but done properly you can just forget about it, I have had it in tanks for over 10 years.
Bit gold plated for tiny mower tank tho :-)
Stand back from success
Stand back from success
I managed to loosen that cursed bolt holding the tank down more by luck than judgement. I will be replacing it with a SS socket head bolt. At least I can chop down an Allen key to suit. That King Dick spanner shown by WP is as rare as hens teeth
https://www.ebay.co.uk/itm/1-4-UNC-A2-STAINLESS-SOCKET-CAPS-IMPERIAL-HE…
I looked inside the tank and its a bit gungy. I might put some gravel in it and give it a whirl on my tumbler to lshake up loose stuff
Having removed the engine cowl I now see a flywheel with several fan blades missing. Maybe look for a spare. I dont see any "window" for points adjustment. Does this imply it has electronic ignition? The flywheel is bolt on with a 24mm nut. I had to send off for a suitable socket for this. Some have said these are fitted on a taper shaft and perhaps dont have a keyway. So if I take off this flywheel I may lose my timing. I would stamp a mark on these items first
Or I may just chicken out and leave well enough alone
As they say, if it aint broke, dont fix it
well I posted some pix and
well I posted some pix and they havent turned up. what have I done wrong?
I'll try again with just one
I'll try again with just one
no that didnt work either
Try this. You can post
Try this. You can post multiple images in one hit.
https://www.oldlawnmowerclub.co.uk/forum/guidelines/adding-images
EDIT
I may have posted an old link,
Try this one
so why does it say this?
so why does it say this?
" You are not allowed to post new content in the forum. "
I wasted an hour trying to find a work around and got nowhere. I followed instructions religiously
Looks like I posted an
Looks like I posted an invalid link.
Apologies, try this
This looks like the fourth
This looks like the fourth separate thread about the same mower restoration. That makes it difficult (and tedious) for our very conscientious contributors to keep track and provide meaningful replies. Please try and keep discussions about one mower/restoration in a single thread.
Another solution, pack the
Another solution, pack the bolt with some washer or a spacer ca 10mm high which will bring the bolt head above the flywheel
As shown there is plenty of clearance to use conventional flat spanners. PHEW why didnt some bright apprentice in Ransomes spot that simple trick
That doesn’t look like a 4”
That doesn’t look like a 4” (100 mm) spacer.
Sorry I meant 10mm or 1/2".
Sorry I meant 10mm or 1/2". Its the sight of that fuel tank that throws me
I had another light bulb
I had another light bulb moment on how to remove this offending bolt. Its crude and destructive but if you are stuck........... Get a tubular spanner 11mm or 7/16" and disc cut off the hexagon part. you should then fit this over the nut and there should be enough hexagon to use a spanner (17mm) or adjustable to give sufficient purchase. Its a 1/4" unc/bsw x 3/4" bolt screws into the aluminium crank case. If seized try 24hrs of plus gas. I always use copper grease when reassembling. It lessens future seizing
Failing that means removing the flywheel if you have a 24mm socket handy
Mountains and molehills come
Mountains and molehills come to mind!!!
Start the day with a smile and get it over with!
actually this is a BSA fault,
actually this is a BSA fault, they assemble the tank then put the fly wheel on. apolgies to ransomes apprentices
As long as the rust stays put
As long as the rust stays put it doesn’t do much harm. I clean them by electrolysis but some people use citric acid. Don’t use “ brick cleaner” or any hydrochloric acid based rust remover as they eat the solder. Tank sealants can have issues of their own.
Tank removal. A flat ( not cranked) ring spanner does the job. If you look right through Chris G’s thread you will find an image that I posted.