Jump to content

  • entries
  • comments
  • views

Rear frame rail interiors anti rust spray

Sign in to follow this  
Mikes Z car


Hi all,

I sprayed all interior channels of the rear frame rails and interior of wheel wells of a 240Z with two cans of Transtar amber anti corrosion material using existing holes where possible. The front frame rails are more likely to rust but I had already sprayed the interior of the front rails on my car. A thread describing how I did the front frame rails is here:


The Transtar amber anti corrosion material I used is described on another blog here:

Hatch anti corrosion interior passageways - Blogs - Classic Zcar Club

240Z rear frame naming convention I used (is there some standard for this?):


Preparation of the four crossmembers:

1. Front two crossmembers- I had to drill two 5/16" (or 8 mm) holes behind the seats on the floor, one behind each seat to access the two crossmembers right behind the seats (what I am calling front crossmembers). Right side -passenger side in U.S. shown -other side prepared in the same way:


These two holes could have been made under the car to avoid having holes in the floor behind the seats.

2. Middle crossmember- I had to enlarge an existing slot at the bottom of one of the shock tower braces on the floor with a large screwdriver to allow access to the interior of what I am calling the middle crossmember. Only one slot needed bending to access most of this crossmember, that one slot can be bent back later if desired, I left it bent open for possible future sprayings since it won't show when I put the shock tower vinyl back down:


I also enlarged a slot on the floor inside the tower braces on both sides of the car to gain access to a two inch long portion of the middle crossmember on both ends of it. The slot I used is closest to the back of the car inside the brace, see the two drawings immediately below for further clarification. This step possibly could have been skipped but I like to spray everything. These two enlarged slots will never be visible in the car.


Total of two slots INSIDE the braces were enlarged, one slot on each side.



3. Rear crossmember- Removed rear plastic interior side panel finishers (not my car- thanks to whoever has this car):


Spraying operation (tip- cover spray nozzle and top of can with a ziploc bag when spraying as wand tends to pop off can sometimes- prevents getting Transtar on your car or hand):

4. Front crossmember right side (both sides done the same way):

Spraying inboard from access hole


Spraying other direction, toward side of car


5. Middle crossmember:

I sprayed the middle crossmember by inserting the wand into the slot I enlarged slightly with a screwdriver. See step 16 below for more info. I also sprayed inside the last two inches of this crossmember on both sides of the car by inserting the wand into an enlarged slot inside each tower brace. See step 2 above for more info.

Top of picture is towards front of car.


6. Rear crossmember (spraying towards middle of car from both sides):

Right side


Left side


7. Frame rail right side (left frame rail was sprayed in the same way):

Spraying forward from access hole


Spraying toward back of car


8. This drawing shows drilled holes location, one of the slots that needed prying open a bit and access for rear crossmember. It does not show the tower brace slots inside the brace that I enlarged for that detail see last two drawings in step 2 above.:


9. Existing holes and "walls" in the rear frame (I used the front four existing holes for spraying both frame rails at the sides of the car, vinyl on shock tower was peeled back for access to middle holes):


Preparation details:

10. For spraying the two front crossmembers behind seats on the floor I drilled a 5/16 inch hole (8 mm also would have worked) in line with an existing hole in frame rails and 40mm from the front edge of the existing frame rail hole. A 5/16" (or 8mm) hole is just large enough to allow the transtar wand with its 360 degree brass spray head to fit through.

11. I pried open the floor sheetmetal slot a bit at the shock tower brace bottom by twisting slightly with a large screwdriver to give access for spraying the center crossmember.

I also pried open the floor sheet metal hidden inside the brace itself to access a two inch long closed off area on both ends of the middle crossmember. Although I did this someone else might want to skip it.

12. I removed the side finisher panels immediately in front of the tail light finisher panel to gain access to the rear most crossmember.

13. I peeled the vinyl up from the floor on the shock tower braces to allow access to an existing hole in the floor to spray the inside of the side frame rails.

14. I poked a hole in the bottom of a trash bag and taped the hole in the bag around the holes I would be spraying into to prevent getting spray on the interior of the car should a wand be pulled too far out of a hole while spraying is in progress.


15. The Transtar plastic spray wand can get kinked when spraying the side frame rails forward of the rear wheels. I actually broke an old wand practicing for the actual spraying and realized the frame rails that go forward and down from the shock towers make two turns, kinda tough on the stiff plastic wand. To minimize the chance of breaking a wand I inserted it gently until it met resistance at the second turn a few inches from the front crossmembers. I pulled the wand out and then inserted it into the existing hole behind the front crossmembers to spray the bottom part of the side rails just behind the seats. This existing hole is 40mm towards the back of the car from the two holes I drilled for the front crossmember. This bottom part of the side frame rails behind the seats is only about 4 inches long so after the wand goes in about 4 inches there will be felt resistance as it tries to turn up towards the shock tower. As soon as I felt that resistance I stopped inserting the wand as I had already done the portion of the frame rail the wand was trying to turn up into from the shock tower hole.

16. The center crossmember didn't want to let the wand go through the bent slot more than a few inches at first with the spray head on it so I used a wand with no spray head that used to come with the spray wand set from Transtar. The wand set I bought 26 Mar 2014 did not have a white third wand with no spray head however a brass spray head could have been cut off the 2nd wand that came with this recently purchased wand set and that headless wand used then. I used the old headless wand I had from the earlier wand kit purchase. I finally did get the wand with the 360 degree brass head to insert the full length of this middle crossmember, I just had to gently keep trying by trying different entry angles and by gently twisting the wand back and forth. Didn't want to kink the wand with brute force.

17. There is a blockage in the rear most crossmember in the middle that is maybe 6 inches long. To get around that I used a headless wand as that is skinny enough to go through the blockage and followed up with a wand with the brass 360 degree head on both side inserting it gently as far as it would go. The 360 degree head has a spray that sprays forward as well as spray towards the sides so the coverage is more than 360 degrees.

18. I made a mess, this project is a great job for the street as the Z frame has many joints for the Transtar spray to flow out of before it becomes waxy non moving anti corrosion material.


While I was at it department - (sung to the tune of that old Beatle's song "I should have known better"):

I also sprayed the interior of the wheel wells since they tend to rust and were accessible with the finisher panels out. After that since I had some Cosmoline handy I painted with a brush all metal I could reach including hidden areas not covered with transtar material. The Cosmoline I have is fairly thick and would not have flowed into the seam the way the freely flowing Transtar material did so I used the Transtar material first on the seam followed up by Cosmoline painted everywhere behind the finisher panel. If I had had no Cosmoline handy I could have dipped a brush into the Transtar spray by spraying the transtar on the bottom of the wheel well first.

Left side of car wheel well. Right side done the same way.


Sign in to follow this  


Recommended Comments

There are no comments to display.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • Blog Statistics

    • Total Blogs
    • Total Entries
  • Blog Comments

    • I agree. We have some great members. @Mike Just remember "Imitation is the sincerest form of flatter". I have a similar yellow and the same bullet mirrors. I love the Rota's on your car although my bumpers will be pure chrome. No strips... It looks great!!!
    • Thanks for the pics, Mike. This site helped me in so many ways. I met people from all over the world and visited a few in New Zealand. The Zed is a unique car. There is actually none like it for the affordable enjoyment. I had one back in '74. Traded it for a 3/4 ton 4X4 Chevy p/u when I moved to the mountains. But I never forgot the excitement and love I had for that first car. In 2005 I bought another one and made it mine with new parts, paint, upholstery, etc. My wife calls it the "acceptable mistress".  I actually met you at the MSA show in 2006 when you complimented me on my hat (purchased from this site). This site is by far the BEST Z car site where folks can come and not be snarked on by the old members. The members here are the most helpful of any site I have visited...so THANK YOU! And thanks to the members who make it so good. Cheers, Mike
    • Thanks John, I also posted a copy of this in our forum under your name.  It will get a lot more traffic in the forums, so be prepared for the responses.
    • My first comment since joining last April.  I would like to share some of my experiences  owning my Z if I may.  I have owned Christine (her nickname)  since 1978 and she currently has 176,898 miles under her hood.  She is in better health than I am, however I'm pushing 85 1/2 years  so she does have an advantage.  During the 38 years I have owned her the only mechanical failure has been a water pump which I replaced about 25 years ago.  In the process of removing the old pump one of the bolts snapped off inside the head.  I installed the new pump minus that one bolt and the pump has never leaked. Within the last two years I had the brake system rebuilt as well as the A/C which still uses R=12 and works great.  She still wears her original white paint job and red interior.  I replaced the orighinal radio for a stereo/CD unit and recovered the seats.  Everything else is original including the dashcover.  She has never slept outside except on a trip to Canada.  I have owned many automobiles  in my lifetime, but never an automobile as reliable, beautiful and fun to drive as Christine.  How she got her name?  About 15 years ago (yeah its been that long) I took her in for a tuneup and valve adjustment.  I was so impressed how she was running I couldn;t wait to get home so I could have my late wife drive her.  I backed her in the garage and asked Shirley to come out for a test drive.  She was never enamored of the car because she felt the Z was pretty fragile in the event of an accident.  I finally got her to come  out and the last thing she said before she got in the car was "i  really don't  want to drive your stupid car!"  I half kiddingly told her to be careful with her language because car's have feelings too.  Well, she proceeds to turn on the ignition and  the car gives off  the loudest  backfire which just reverberated throughout the garage.  Shirley had a white knuckle grip on the steering wheel.  She finally let go and bolted out of the car.  I got into no small amount of hot water laughing at what had just occurred.  She never drove the car after that day and we never spoke of the incident after that day.  Christine had never backfired before that day nor has she since.  God's truth.  From that day on we referred to her as Christine after Stephen King's novel of the same name. Like i am sure all of you,  I love my Z.  Not only for the precious memories but also because I think they are special automobiles from both a design and well as a mechanical aspect.  Thanks for listening. John Petkovich
    • I had a lady friend that lived in San fran when they were filming bullit. The movie production team had her car towed because it was on the route where they were shooting the film. Knowing her, she ran over the big orange cones to park in her space.  She was pissed just thinking about it and that was 35 years later. She said it was very "noisy"  

Important Information

By using this site, you agree to our Terms of Use. We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.