Jump to content

IGNORED

Cowl rust blasting


MH77280Z

Recommended Posts

Guys, this is the only rust area i have, the cowl. I am thinking of blasting it as the wire brush is not good enough. This is heavy rust but still no pitting like damage.

Top is ok, Issue is how much i can blast on the lower area. Also i think the passenger side has air passage into the blower motor i believe? my blower motor and air heating works fine. I would assume all the media will just get into the blower motor and through that inn the ducts?

How should i prevent that? or just seal that side and do it with hand, blast the center and driver side only?

unnamed.jpg

Link to comment
Share on other sites

yes there's the intake for the blower motor and also the cowl drains you would need to block and not sure if media would get into the side air plenums too. Pretty difficult with the dash still installed, might be able to block from the top. To properly blast, coat and seam seal that whole area you'd need to remove the whole top cowl panel, which is a pretty involved process. anything less would be a band aid treatment, but if theres not too serious rust you could do what you can with wire wheels and then use something that converts the rust and coats at the same time. I think eastwood has a few products  

  • Agree 2
Link to comment
Share on other sites

I did this job to my silver 240z a few years ago. 

Blasting wasn't an option for me so I used a combination of wire wheels, paint stripper, putty knives, and phosphoric acid. I soaked paper shop rags in phosphoric acid and placed them on the metal. This is how I removed most all of the rust.

I also cut out the rain cover over the fan blower intake so that I could gain access to areas below it. I reinstalled the rain cover using a silicone sealant rather than welding it. 

After everything was all clean, I epoxy primed, seam sealed, primed again, and painted. 

I should also mention that I had the dash out of the car and the interior was totally removed. This made it easier to deal with the fan blower air intake.

It was a miserable job. I don't ever want to have to do it again.

  • Like 1
Link to comment
Share on other sites

1 minute ago, 240ZBUILTBYME said:

Your dash looks pretty cracked, why not remove and have it reskinned? big job though if you arent doing a full restoration.

I might take the dash out as there is a slight coolant leak from the vacuum cook valve etc. I have a replacement for that.

Based on @jonathanrussell input too. I am thinking just to properly seal block the passenger side cowl where the blower intake is. Blast the other side as much as possible. Treat the passenger side like @jonathanrussell mentioned by hand. Later take the dash out to change the vacuum cook etc. This way any residual blast media if any can be taken out. Meanwhile disconnect the fan.

 

Link to comment
Share on other sites

  • 3 months later...
On 10/5/2022 at 10:32 AM, jonathanrussell said:

I did this job to my silver 240z a few years ago. 

Blasting wasn't an option for me so I used a combination of wire wheels, paint stripper, putty knives, and phosphoric acid. I soaked paper shop rags in phosphoric acid and placed them on the metal. This is how I removed most all of the rust.

I also cut out the rain cover over the fan blower intake so that I could gain access to areas below it. I reinstalled the rain cover using a silicone sealant rather than welding it. 

After everything was all clean, I epoxy primed, seam sealed, primed again, and painted. 

I should also mention that I had the dash out of the car and the interior was totally removed. This made it easier to deal with the fan blower air intake.

It was a miserable job. I don't ever want to have to do it again.

Changed my mind about blasting. What phosphoric acid rust removing product u used? I think i can work it off and then just seal it like you. Appreciate some guidance. Weather is gotten better and dry!!!

Plan on picking up this tomorrow: https://www.acehardware.com/departments/home-and-decor/cleaning-and-disinfectants/rust-removers/13868

Edited by MH77280Z
Link to comment
Share on other sites

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
×
×
  • Create New...

Important Information

By using this site, you agree to our Privacy Policy and Guidelines. 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.