bulkhead blues

Topic: bulkhead blues (Read 12047 times) previous topic - next topic

Re: bulkhead blues

Reply #175 – July 16, 2012, 06:11:29 pm

Pierce,

Quote from: Pierce & Gaylie Stewart – July 16, 2012, 04:41:20 pm

Chuck,

That's my photo. Who grabbed it, uploaded it to Picasa and linked it to the engineering site?

Pierce

I have no way of knowing, would suggest if it's truly important that you contact the original poster. I see he has the image on a Picasaweb site, other albums include a Bluebird RV, Prevost, with work going on, the original post was July 7.

Re: bulkhead blues

Reply #176 – July 16, 2012, 08:53:03 pm

Chuck,

No big deal. Was just a surprise to see it at other sites. Am sure the poster just wanted to try to find a reason for the failures.

P

Re: bulkhead blues

Reply #177 – July 16, 2012, 09:41:54 pm

Peter, can you elaborate on exactly where the drain holes were made?

Re: bulkhead blues

Reply #178 – July 16, 2012, 09:51:09 pm

Quote from: fjm502 – July 16, 2012, 09:41:54 pm

Peter, can you elaborate on exactly where the drain holes were made?

I'll take pictures and post tomorrow.
Peter

Re: bulkhead blues

Reply #179 – July 16, 2012, 11:20:44 pm

Re Peter's mention of drain holes: I used to tell my customers that if they couldn't keep the coolant and chips out of their fixtures then give the coolant and chips a way to get out.

If you can't keep water out of the concerned area then find a way to have it exit with all possible speed in order to prevent heavy rusting. corrosion, swelling of the wood.

A grade 8 3/8-16 socket head cap screw/bolt has a minimum tensile strength of 13,900 lbs.

940 inch pounds of torque will cause failure of a 3/8-16 SHCS. The average tension induced in a 3/8-16 SHCS tightened to yield is10,850#
So, do not overtighten!

Re: bulkhead blues

Reply #180 – July 17, 2012, 11:13:12 am

Quote from: fjm502 – July 16, 2012, 09:41:54 pm

Peter, can you elaborate on exactly where the drain holes were made?

I went to look and cannot locate these holes. Either they're too small, or I just cannot locate them. I'll have to call James when we get back from the Indiana Bunes.
Peter

Re: bulkhead blues

Reply #181 – July 17, 2012, 08:40:38 pm

Here's what the bulkhead area looks like after the fix from Xtreme.
Peter

Re: bulkhead blues

Reply #182 – July 17, 2012, 08:43:48 pm

Peter if it where me I would be cleaning and coating that angle and area with a sealer, too many open holes for my liking. Get a few cans of underbody rubber spray and coat it good
John H

Re: bulkhead blues

Reply #183 – July 17, 2012, 08:49:12 pm

Actually, one can of automotive undercoating and a couple of hours and you are good to go.

Brett

Re: bulkhead blues

Reply #184 – July 17, 2012, 09:02:55 pm

I definitely agree. It seems the quality is lacking a bit on this job. I'll coat this area well after plugging the openings left by the vacant Roloks.
Peter

Re: bulkhead blues

Reply #185 – July 17, 2012, 09:39:29 pm

I am presently doing my front bulkhead. Several bolts broken, but not too much rust jacking. The widest crack is about 1/4" at the angle iron. I found easy way to remove the rust that is caked between the 2" angle iron and the bulkhead. I used a air hammer and blunt end chisel, Air Chisel - Harbor Freight Tools on the angle iron. The rust just cascaded down from the crack from the vibrations it makes. Then I used a saw blade to clean anything that was left.

If you have access to air supply this is the way to go to get the maximum amount of rust out without spreading the joint apart. The air hammer is pretty cheap but does a good job, and it is handy for other projects such as removing a muffler or removing a pulley that is frozen on a shaft, just put the chisel on the end of the shaft and pull the trigger. The vibrations that it produces will walk the frozen part right off the shaft, of course a little penetrating oil helps.

Re: bulkhead blues

Reply #186 – July 17, 2012, 10:31:12 pm

What are you doing for a repair as far as bolts go?

Re: bulkhead blues

Reply #187 – July 18, 2012, 10:29:43 pm

I am putting in 3/8 x 3" grade 8 bolts with a 1/4" x1-1/2" square backup washers about 18" apart and about a dozen or more 5/16" x3" Roloks. Before installing the bolts I sprayed 763 rust transformer solution by Chesterton up inside the gap. This should retard any rust in the future. Technical Products - Technische Produkte - Productos técnicos - Technické

I will then seal the seam with a good RTV sealent and finish it off with some undercoating spray. I think that will last as long as I have the RV, and it will probably outlast me, seeing as how I will be 73 in October

Re: bulkhead blues

Reply #188 – July 19, 2012, 04:39:06 pm

Next on the Foretravel to-do list is torquing the Rolocks and undercoating the bulkheads. It looks to be in pretty good shape but where the coach lives in the land of salt and snow now I want to be sure it stays that way.
My question is that I have a good Snap-on torque wrench but it only reads foot pounds. Is there a conversion from inch to foot pounds that I can use?

Dean

Re: bulkhead blues

Reply #189 – July 19, 2012, 04:45:04 pm

Quote from: Dean & Dee – July 19, 2012, 04:39:06 pm

My question is that I have a good Snap-on torque wrench but it only reads foot pounds. Is there a conversion from inch to foot pounds that I can use?

Ummm....

There are 12 inches in a foot..... So 12 inch-pounds = 1 foot-pound....

Yes, it's that simple

-M

Re: bulkhead blues

Reply #190 – July 19, 2012, 04:47:53 pm

Quote from: Steve & Michelle – July 19, 2012, 04:45:04 pm

Ummm....

There are 12 inches in a foot..... So 12 inch-pounds = 1 foot-pound....

Yes, it's that simple

-M

Duh, okay Michelle, that will teach me to type before I think.

Re: bulkhead blues

Reply #191 – July 19, 2012, 04:55:12 pm

Quote from: Dean & Dee – July 19, 2012, 04:47:53 pm

Duh, okay Michelle, that will teach me to type before I think.

Hmmm, just for giggles I Googled inch to ft. pound calculators to convert the 250 inch pounds and it says the correct conversion is 1" pound force equals 0.0833333333 foot pounds.

Dean

Re: bulkhead blues

Reply #192 – July 19, 2012, 05:00:31 pm

Quote from: Dean & Dee – July 19, 2012, 04:55:12 pm

Hmmm, just for giggles I Googled inch to ft. pound calculators to convert the 250 inch pounds and it says the correct conversion is 1" pound force equals 0.0833333333 foot pounds.

Yup, 1 divided by 12 = 0.08333333etc....

Re: bulkhead blues

Reply #193 – July 19, 2012, 05:02:05 pm

Quote from: Dean & Dee – July 19, 2012, 04:55:12 pm

Hmmm, just for giggles I Googled inch to ft. pound calculators to convert the 250 inch pounds and it says the correct conversion is 1" pound force equals 0.0833333333 foot pounds.

Dean

So it looks like 250 inch pds equals 20.83333 ft. pds.

Thanks, Dean

Re: bulkhead blues

Reply #194 – July 19, 2012, 05:03:43 pm

Quote from: Dean & Dee – July 19, 2012, 05:02:05 pm

So it looks like 250 inch pds equals 20.83333 ft. pds.

Thanks, Dean

CORRECT.

And, most 1/2" torque wrenches do not accurately go that low (at least my Snap-on wrench does not). So I use a 3/8" drive inch-lb torque wrench.

Brett

Re: bulkhead blues

Reply #195 – July 19, 2012, 05:08:17 pm

Quote from: wolfe10 – July 19, 2012, 05:03:43 pm

CORRECT.

And, most 1/2" torque wrenches do not accurately go that low (at least my Snap-on wrench does not). So I use a 3/8" drive inch-lb torque wrench.

Brett

Yep, just looked at my Snap-on and you are right Brett. Goes down to 50-lb. Sigh. Guess I am in the market for an inch lb torque wrench.
Dean

Re: bulkhead blues

Reply #196 – July 19, 2012, 06:02:32 pm

My Craftsman torque wrench goes down to 10 ft. lbs.

Re: bulkhead blues

Reply #197 – July 19, 2012, 06:20:31 pm

Torque wrenches are most accurate near the middle of their ranges, rather than near either extreme. In fact, the same goes for most any kind of gauge. So if it goes from 10 to 100ft lbs, it won't be very accurate around 20... I actually had a brief stint in the navy where I calibrated torque wrenches. Don't remember much, but that was a long time ago!
Don

Quote from: fjm502 – July 19, 2012, 06:02:32 pm

My Craftsman torque wrench goes down to 10 ft. lbs.

Re: bulkhead blues

Reply #198 – July 19, 2012, 06:31:42 pm

Quote from: acousticart – July 19, 2012, 06:20:31 pm

Torque wrenches are most accurate near the middle of their ranges, rather than near either extreme. In fact, the same goes for most any kind of gauge. So if it goes from 10 to 100ft lbs, it won't be very accurate around 20... I actually had a brief stint in the navy where I calibrated torque wrenches. Don't remember much, but that was a long time ago!
Don

After a brief internet search they seem to range in price from $20. (Harbor Frieght) to $300. and I am sure the quality and accuracy have the same range. In the past I have had good luck with tools from NAPA. I have to pick up some undercoating for the bulkhead anyway so I will see what they have.

D&D

Re: bulkhead blues

Reply #199 – July 19, 2012, 06:40:30 pm

I am with Brett with the Snap-On torque wrenches, Why I have both Ft Lb & In Lb wrenches.
Look at it this way,
Snap-On is like haveing a Foretravel
Craftsman is like haveing a Fleetwood
Both will get you there, one give you the warm fuzzies about the quality.

FWIW
Dave M

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