633-753 Gas Tank Removal

[Pogo 57 10]

1. Just getting back into WH tractors and I have a leaky 2 piece gas tank.  I am weighing a few options, but what do I have to do to remove the tank?  Does the amp gage have to be removed?  I have looked over many posts here and not finding anything.  Has anyone tig welded one around the seam?  I would think that would be a permanant fix.  Need help on this one.
2.  

[rjg854 11,376]

I have an 854 that the PO welded the tank.  I've never had any problems with it.  So it can be done.

[Achto 27,594]

13 minutes ago, Pogo 57 said:

what do I have to do to remove the tank?  Does the amp gage have to be removed?

 

Gauge, throttle cable, choke cable.

 

I do believe that @Pullstart welded up a 2 piece tank.

Edited May 9, 2023 by Achto

[ri702bill 8,327]

AND the steering wheel, or whole steering shaft and then remove the gear and collar.

I have repaired 2 tanks, a 502 and 854 using the NEW material gasket available on fleabay - use his recommeded sealant....

Bill

[Pullstart 62,905]

 back to the  game!  
 

All that was mentioned above.  I used the KBS system to seal up pinholes after welding.  The aluminum seems quite pours, and had 60+ years of fuel, chemicals, etc. in it.  It was very dirty and welded very poorly.

[Pullstart 62,905]

If I were to do it again, I’d skip the welding part and go right to KBS.  It has held up great since 2019!

[Handy Don 12,233]

2 hours ago, Pogo 57 said:

1. Just getting back into WH tractors and I have a leaky 2 piece gas tank.  I am weighing a few options, but what do I have to do to remove the tank?  Does the amp gage have to be removed?  I have looked over many posts here and not finding anything.  Has anyone tig welded one around the seam?  I would think that would be a permanant fix.  Need help on this one.
2.  

You do have a number of options.

 

I replaced my bent tank with one from a 701 which allowed me to create a custom wood dash panel so I could have both an ammeter and voltmeter as well as choke and throttle and still have room for a future light switch. I was not seeking “originality” so that is one path. (The bend in the tank was my fault and not repairable and both hoodscrew sockets had been wrecked before it came to me.)

 

Welding can be done by someone skilled with aluminum castings. Some members have noted that the quality of the aluminum comprising these tanks is uneven, which can challenge a welder.

 

The KB system mentioned above has seen good results--the preparation steps must be followed precisely.

 

If you do decide to repair using a new gasket and its sealer, the CRITICAL step is the CAREFUL removal of the 13 screws holding the two pieces together! Do not be hasty or force them. Also, you can search here for some solutions if your hoodscrew sockets are ruined.

 

Good luck!

[ri702bill 8,327]

Me thinks the TIG option would be done WITHOUT a tank gasket - the 2 parts would be dis-assembled, ALL interior and mating surfaces cleaned - use whatever many of those pesky 13 #8-32 screws are left after breaking a few to "Fixture" the 2 parts for welding.... Then the tank sealer inside.

Bill

[ri702bill 8,327]

3 hours ago, Handy Don said:

Also, you can search here for some solutions if your hoodscrew sockets are ruined.

As Don mentioned - the 701/702 one piece tank has solid tapped holes for the hood thumbscrews, not the breakout prone thin section for the speed nut. These bolt right in.

[Pogo 57 10]

Well Guys I got the tank out and 12 of the 13 screws loose.  ONE IS PRETTY TIGHT AND i HAVE BEE TRYING TO GET SOME kROIL to sk in.  Would heating the area with a heat gun help?  Still not sure what route I am going to go.  Going to talk to my welding guy and see if he is interested in doing it .  I still may seal the stank with KBS if I weld.  Thoughts on that idea?

[Handy Don 12,233]

45 minutes ago, Pogo 57 said:

ONE IS PRETTY TIGHT AND i HAVE BEE TRYING TO GET SOME kROIL to sk in.  Would heating the area with a heat gun help? 

Yes, heat/cool cycles will help. Being aluminum, which conducts heat much better than steel, handle with care. Also, where with steel I’d consider getting it very hot, with aluminum I’d back off a bit. Kroil will get in there in time, especially helped by the heat/cool cycling. It may take several cycles!

[Wild Bill 633 846]

Has anyone tried fabricating a gas tank to go inside the OEM?

[Handy Don 12,233]

39 minutes ago, Wild Bill 633 said:

Has anyone tried fabricating a gas tank to go inside the OEM?

Funny you bring this up. WH offered a “repair” for leaking two piece tanks that was, essentially, remove the bottom, get rid of the fuel nipple, reassemble with a plastic tank tucked inside the aluminum one with its neck sticking out the top and its fuel nipple sticking out the bottom. 

Converted a 1 gallon tank to, if I recall, 1.5 quarts!

I’ve never seen one.

There is a service bulletin document on the forum that describes it.

[Pogo 57 10]

Got the tanks a part with no broken screws!  Someone tried to seal it and didn't  do a good job.  Have spent the day cleaning and O think I found someone that will wekd it up.  I may still put  KBS in it when I'm done..  Thanks for all the help and guidance.

[Wild Bill 633 846]

For everyone's info, Dow Corning Dow-Sil 730 FS is a solvent resistant sealant. Make sure you are sitting down when you see the cost.

[Pogo 57 10]

Ok guys, can't find anyone that will take a chance on welding my tank.  So, where can I get  a gasket and sealer for it?  Think I'll still red cote it afterwards.. Thanks Again.

 

[Wild Bill 633 846]

4 hours ago, Pogo 57 said:

So, where can I get  a gasket

https://www.ebay.com/itm/285106835017?hash=item4261b10e49:g:sb8AAOSwnDZT596U&amdata=enc%3AAQAIAAAA0Iqwv14u3F%2Bex3tsTQT3z%2B9LGzgMCCzF1VRG0trtIZNes%2FUbwRQR59%2Bcdv13txrCHiHoaJ4EddWPMYamkP31KU7VMuReFN7qTXuUEzdFMlGwP0msH0kZ0qnQZoFd3WxZsf6%2F4dbpqpRTf3GH%2F9cVsQ%2Bs2vbQwM1pYP2UiN2r14nQlvwtrRbLWNunMG1yl2vjd7Bf%2F10bPrvo%2FWSTL8Amm4OFkpzbzX4ohHyyLWQTkfPFo5HwU9mCYyjgx6%2F8hqwlr4O5RIsBNjHqNJOWKfwtOq8%3D|tkp%3ABk9SR9TEg4iGYg

and sealer for it?

Dow Corning Dow-Sil 730 FS is a solvent resistant sealant.

[kpinnc 12,066]

On 5/12/2023 at 3:37 PM, Wild Bill 633 said:

Has anyone tried fabricating a gas tank to go inside the OEM?

 

Isn't there a motorcycle tank repair kit that uses a resin that you roll around in the tank until it's covered, then pour out the excess before it sets? Seems like I've read about those and they had fairly good reviews.

[Handy Don 12,233]

39 minutes ago, kpinnc said:

 

Isn't there a motorcycle tank repair kit that uses a resin that you roll around in the tank until it's covered, then pour out the excess before it sets? Seems like I've read about those and they had fairly good reviews.

Yep, that’s the KBS sealer system (and others)