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Anyone replaced a rear fender on a HMMWV?

820jeep

820jeep

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Just getting started replacing a damaged right rear fender. Removing Tail light and side maker light, unhooking fuel filler neck and starting the long process of drilling-grinding rivets. Has anyone done this before? Have any pointers or suggestions? Thanks, Bob
 
820jeep

820jeep

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820jeep said:
Just getting started replacing a damaged right rear fender. Removing Tail light and side maker light, unhooking fuel filler neck and starting the long process of drilling-grinding rivets. Has anyone done this before? Have any pointers or suggestions? Thanks, Bob
Click to expand...
IMG_0317.jpeg
 
chucky

chucky

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Spring loaded center punch to center your drill bit better and the same sise bit as original hole so you dont stretch the holes out having to hammer the heads off they should fall off when you pull the bit out ! LOL You will just have to get the rivet heads off your drill bit with a pair of pliers !
 
cwc

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My son and I replaced a rear fender over the summer. I found the Youtube video by AMTAK2 to be helpful. One thing we did different was that we completely removed and reattached the piece across the front attachment point (behind the rear seat area) rather than cutting a v-notch in it and bending it. For removing the rivets, we mostly used an air chisel with the point ground into a punch matching the pin diameter, knocked the pins out, drilled through the heads with a larger drill until the heads came off, then punched out the remainder. This went really fast with two working on it after getting the technique right.

The Cherrymax rivets are really hard to set manually, so I took advice in other threads here on SS and bought the Milwaukee M12 rivet gun, actually the 2550-22 kit that includes two batteries, charger, the nose pieces and carrying case. It did a good job setting the rivets. We had a bit of trouble initially with it pulling and stopping when the trigger was pulled, which seemed to be a problem with the feed of the mandrels into the catch chamber. A little shake after each rivet seemed to make it work a lot better, or maybe it just took a while to break in.

TM9-2320-280-24P (Figs 197 & 199) is useful for identifying where the various lengths of rivets are used. The -3 length rivets are readily available, but other lengths are harder to find. I ended up buying several lengths from Skybolt Aerospace Fasteners (e.g. CR3213-6-4, CR3213-6-7 and CR3213-6-9). The Cherrymax rivets are sensitive to the grip length and won't pull right if they are too long or too short for the material. For example, the -3 rivets work for a range of 3/16 down to 2/16 (1/8"), so they work for either three or two thicknesses of the fender material, such as when riveting the connection between the fender and the floor of the bed. In a few places the rivets were too long, and pulled better with a 3/16" rivet washer on the back side; these washers are about 1/16" thick and are a hardware store item. As I recall, the -9s at the back of the fender that pass through the heavy structural member pulled better (tighter) with a washer on them. Also, you might find some rivets for sale that are oversize, i.e. increased diameter for dealing with damaged holes. If you use oversize rivets you will probably want to get the matching drill. As I recall, the standard rivet uses a #10 drill (0.193"), and oversize Cherrymax rivets use a #5 (0.205").
 

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chucky

chucky

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Mogman said:
I know this is sacrilege but I sometimes use a wood chisel, having a handle sometimes comes in handy.
Click to expand...
LOL do the humv use aluminum rivets ? I bought a school bus back years ago that had been hit hard in the rear drivers corner but the rain gutter up was good i bet i drilled and removed 500 rivets in the corner and then decided to add baggage bays underneath both sides so i drilled and installed anther 500 at least and to this day i get sick to think ive got to drill and replace rivets ! If you dont want to go back with rivets you could plug weld the holes easy with a wire gun and hold either a carbon black block or copper block in behind where your filling the hole up !
 
cwc

cwc

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chucky said:
Spring loaded center punch to center your drill bit better and the same sise bit as original hole so you dont stretch the holes out having to hammer the heads off they should fall off when you pull the bit out ! LOL You will just have to get the rivet heads off your drill bit with a pair of pliers !
Click to expand...
This works good too - after knocking out the pins then run through with a 3/16 drill, you'll have a whole stack of the heads on the drill bit.
 
Mogman

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cwc said:
My son and I replaced a rear fender over the summer. I found the Youtube video by AMTAK2 to be helpful. One thing we did different was that we completely removed and reattached the piece across the front attachment point (behind the rear seat area) rather than cutting a v-notch in it and bending it. For removing the rivets, we mostly used an air chisel with the point ground into a punch matching the pin diameter, knocked the pins out, drilled through the heads with a larger drill until the heads came off, then punched out the remainder. This went really fast with two working on it after getting the technique right.

The Cherrymax rivets are really hard to set manually, so I took advice in other threads here on SS and bought the Milwaukee M12 rivet gun, actually the 2550-22 kit that includes two batteries, charger, the nose pieces and carrying case. It did a good job setting the rivets. We had a bit of trouble initially with it pulling and stopping when the trigger was pulled, which seemed to be a problem with the feed of the mandrels into the catch chamber. A little shake after each rivet seemed to make it work a lot better, or maybe it just took a while to break in.

TM9-2320-280-24P (Figs 197 & 199) is useful for identifying where the various lengths of rivets are used. The -3 length rivets are readily available, but other lengths are harder to find. I ended up buying several lengths from Skybolt Aerospace Fasteners (e.g. CR3213-6-4, CR3213-6-7 and CR3213-6-9). The Cherrymax rivets are sensitive to the grip length and won't pull right if they are too long or too short for the material. For example, the -3 rivets work for a range of 3/16 down to 2/16 (1/8"), so they work for either three or two thicknesses of the fender material, such as when riveting the connection between the fender and the floor of the bed. In a few places the rivets were too long, and pulled better with a 3/16" rivet washer on the back side; these washers are about 1/16" thick and are a hardware store item. As I recall, the -9s at the back of the fender that pass through the heavy structural member pulled better (tighter) with a washer on them. Also, you might find some rivets for sale that are oversize, i.e. increased diameter for dealing with damaged holes. If you use oversize rivets you will probably want to get the matching drill. As I recall, the standard rivet uses a #10 drill (0.193"), and oversize Cherrymax rivets use a #5 (0.205").
Click to expand...
I was going to post that video until I saw he was cutting a v notch in the brace
 
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V

Vapor Trail

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cwc said:
My son and I replaced a rear fender over the summer. I found the Youtube video by AMTAK2 to be helpful. One thing we did different was that we completely removed and reattached the piece across the front attachment point (behind the rear seat area) rather than cutting a v-notch in it and bending it. For removing the rivets, we mostly used an air chisel with the point ground into a punch matching the pin diameter, knocked the pins out, drilled through the heads with a larger drill until the heads came off, then punched out the remainder. This went really fast with two working on it after getting the technique right.

The Cherrymax rivets are really hard to set manually, so I took advice in other threads here on SS and bought the Milwaukee M12 rivet gun, actually the 2550-22 kit that includes two batteries, charger, the nose pieces and carrying case. It did a good job setting the rivets. We had a bit of trouble initially with it pulling and stopping when the trigger was pulled, which seemed to be a problem with the feed of the mandrels into the catch chamber. A little shake after each rivet seemed to make it work a lot better, or maybe it just took a while to break in.

TM9-2320-280-24P (Figs 197 & 199) is useful for identifying where the various lengths of rivets are used. The -3 length rivets are readily available, but other lengths are harder to find. I ended up buying several lengths from Skybolt Aerospace Fasteners (e.g. CR3213-6-4, CR3213-6-7 and CR3213-6-9). The Cherrymax rivets are sensitive to the grip length and won't pull right if they are too long or too short for the material. For example, the -3 rivets work for a range of 3/16 down to 2/16 (1/8"), so they work for either three or two thicknesses of the fender material, such as when riveting the connection between the fender and the floor of the bed. In a few places the rivets were too long, and pulled better with a 3/16" rivet washer on the back side; these washers are about 1/16" thick and are a hardware store item. As I recall, the -9s at the back of the fender that pass through the heavy structural member pulled better (tighter) with a washer on them. Also, you might find some rivets for sale that are oversize, i.e. increased diameter for dealing with damaged holes. If you use oversize rivets you will probably want to get the matching drill. As I recall, the standard rivet uses a #10 drill (0.193"), and oversize Cherrymax rivets use a #5 (0.205").
Click to expand...
Great description CWC, thank you. I have to do one soon too so that'll be very helpful.
 
820jeep

820jeep

Member
232
16
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Location
Fort Worth Texas
cwc said:
My son and I replaced a rear fender over the summer. I found the Youtube video by AMTAK2 to be helpful. One thing we did different was that we completely removed and reattached the piece across the front attachment point (behind the rear seat area) rather than cutting a v-notch in it and bending it. For removing the rivets, we mostly used an air chisel with the point ground into a punch matching the pin diameter, knocked the pins out, drilled through the heads with a larger drill until the heads came off, then punched out the remainder. This went really fast with two working on it after getting the technique right.

The Cherrymax rivets are really hard to set manually, so I took advice in other threads here on SS and bought the Milwaukee M12 rivet gun, actually the 2550-22 kit that includes two batteries, charger, the nose pieces and carrying case. It did a good job setting the rivets. We had a bit of trouble initially with it pulling and stopping when the trigger was pulled, which seemed to be a problem with the feed of the mandrels into the catch chamber. A little shake after each rivet seemed to make it work a lot better, or maybe it just took a while to break in.

TM9-2320-280-24P (Figs 197 & 199) is useful for identifying where the various lengths of rivets are used. The -3 length rivets are readily available, but other lengths are harder to find. I ended up buying several lengths from Skybolt Aerospace Fasteners (e.g. CR3213-6-4, CR3213-6-7 and CR3213-6-9). The Cherrymax rivets are sensitive to the grip length and won't pull right if they are too long or too short for the material. For example, the -3 rivets work for a range of 3/16 down to 2/16 (1/8"), so they work for either three or two thicknesses of the fender material, such as when riveting the connection between the fender and the floor of the bed. In a few places the rivets were too long, and pulled better with a 3/16" rivet washer on the back side; these washers are about 1/16" thick and are a hardware store item. As I recall, the -9s at the back of the fender that pass through the heavy structural member pulled better (tighter) with a washer on them. Also, you might find some rivets for sale that are oversize, i.e. increased diameter for dealing with damaged holes. If you use oversize rivets you will probably want to get the matching drill. As I recall, the standard rivet uses a #10 drill (0.193"), and oversize Cherrymax rivets use a #5 (0.205").
Click to expand...
Thank you, lots of good information. This kind of help was what I was looking for.
 
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