Can trailer bunk replacement

Trailer related issues and discussion goes here.
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the hammer
Posts: 190
Joined: 08 Mar 2007, 15:39
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Location: Taylors, SC

Can trailer bunk replacement

Post by the hammer »

Should it be a two man job or can one guy do it reasonably easily?

lckstckn2smknbrls
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Location: Algonquin Il

Can trailer bunk replacement

Post by lckstckn2smknbrls »

The couple of 2x4 bunk set I have done went easy for me.
1971 14' Ward's Sea King Jon Boat / 1983 Mariner 25HP

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Riverdog
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Location: Hutto, TX

Can trailer bunk replacement

Post by Riverdog »

One man should be able to do it.
An extra 2X4 and one or two bottle jacks, maybe a couple of cinder blocks.
Lift just enough to slide old bunk out.
Do one side at a time.
Last edited by Riverdog on 29 Dec 2019, 13:16, edited 1 time in total.
2013 1752 Blazer SS Mercury 60/40


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CedarRiverScooter
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Joined: 13 Nov 2014, 08:01
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Can trailer bunk replacement

Post by CedarRiverScooter »

To get boat weight off trailer:

Lower trailer tongue to ground.
Put concrete blocks under transom corners, maybe use some carpet/wood blocking to prevent damage.
Raise tongue as high as practical.
Block up keel near bow - you might need a spreader bar if tongue is in the way.
Level trailer out, boat weight is now off trailer.

Be careful crawling underneath.

Redundant support of the boat weight will save your life there.

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LDUBS
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Location: Clayton California

Can trailer bunk replacement

Post by LDUBS »

CedarRiverScooter wrote:
27 Dec 2019, 23:20
To get boat weight off trailer:

Lower trailer tongue to ground.
Put concrete blocks under transom corners, maybe use some carpet/wood blocking to prevent damage.
Raise tongue as high as practical.
Block up keel near bow - you might need a spreader bar if tongue is in the way.
Level trailer out, boat weight is now off trailer.

Be careful crawling underneath.

Redundant support of the boat weight will save your life there.
X2. This method is easy and effective. Instead of cinder blocks I built a simple cradle out of scrap 2x's to support the transom. I use a short length of scrap 4x4 crossways under the bow stem supported by jack stands. Because the bottom of the hull is right there, this method also allows you to adjust the bunks so that they are a perfect fit to the hull.
Have Rod - Will Fish

the hammer
Posts: 190
Joined: 08 Mar 2007, 15:39
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Location: Taylors, SC

Can trailer bunk replacement

Post by the hammer »

CedarRiverScooter wrote:
27 Dec 2019, 23:20
To get boat weight off trailer:

Lower trailer tongue to ground.
Put concrete blocks under transom corners, maybe use some carpet/wood blocking to prevent damage.
Raise tongue as high as practical.
Block up keel near bow - you might need a spreader bar if tongue is in the way.
Level trailer out, boat weight is now off trailer.

Be careful crawling underneath.

Redundant support of the boat weight will save your life there.
Thanks for your Step By Step.
My primary reason for asking about off-water change was not knowing if my permit was transferable from my current boat to a new craft. I contacted the warden and they said it was transferable. I’ll probably go this weekend and change the bunks out down at the lake. I got under the boat a few days ago to see how everything looked and made my plans accordingly.
I can’t guarantee photo documentation but I’ll try to get some pix.

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JL8Jeff
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Location: Ewing, NJ

Can trailer bunk replacement

Post by JL8Jeff »

I've done it both ways to a my last 2 boats/trailers. My 16' Lowe I swapped the rollers for bunks at the boat ramp with the boat in the water. On my sprint boat, I used a spare 2x4 as a temporary bunk and lifted one side of the boat off one old bunk with the 2x4 and floor jack (with jackstands as a backup) and pulled the old bunk out. I put the new bunk in place and drilled the holes for the mounting bracket on one end and bolted it on, then the other end to make sure it was lined up. Then I dropped the jack down with the 2x4 and went and did the other side. That way, most of the boat weight is still on one bunk and the trailer.
Attachments
trailer with old rollers
trailer with old rollers
trailer with new bunks
trailer with new bunks
2001 Lowe Roughneck 1652 VT with Merc 60/45 jet 2 stroke

the hammer
Posts: 190
Joined: 08 Mar 2007, 15:39
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Location: Taylors, SC

Can trailer bunk replacement

Post by the hammer »

JL8Jeff wrote:
30 Dec 2019, 17:42
I've done it both ways to a my last 2 boats/trailers. My 16' Lowe I swapped the rollers for bunks at the boat ramp with the boat in the water. On my sprint boat, I used a spare 2x4 as a temporary bunk and lifted one side of the boat off one old bunk with the 2x4 and floor jack (with jackstands as a backup) and pulled the old bunk out. I put the new bunk in place and drilled the holes for the mounting bracket on one end and bolted it on, then the other end to make sure it was lined up. Then I dropped the jack down with the 2x4 and went and did the other side. That way, most of the boat weight is still on one bunk and the trailer.
The reason I didn’t think I could do it on dry land w/floor jack and jackstands was a concern about ribs snapping while the boat was on lifts.

the hammer
Posts: 190
Joined: 08 Mar 2007, 15:39
12
Location: Taylors, SC

Can trailer bunk replacement

Post by the hammer »

JL8Jeff wrote:
30 Dec 2019, 17:42
I've done it both ways to a my last 2 boats/trailers. My 16' Lowe I swapped the rollers for bunks at the boat ramp with the boat in the water. On my sprint boat, I used a spare 2x4 as a temporary bunk and lifted one side of the boat off one old bunk with the 2x4 and floor jack (with jackstands as a backup) and pulled the old bunk out. I put the new bunk in place and drilled the holes for the mounting bracket on one end and bolted it on, then the other end to make sure it was lined up. Then I dropped the jack down with the 2x4 and went and did the other side. That way, most of the boat weight is still on one bunk and the trailer.
The reason I didn’t think I could do it on dry land w/floor jack and jackstands was a concern about ribs snapping while the boat was on lifts.

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