Engine hatch replacement

jjdebarros

New member
Oct 30, 2019
26
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3
Spokane, WA
I am in the process of replacing the intake manifold and I will be able to get rid of my 'dog house' engine hatch.

Any suggestions on what materials to use in building a new level one, and how to insulate it?

Thanks!
 

tmsnyder

Active member
Oct 7, 2019
485
104
43
Buffalo NY
Just to clarify, you had an engine cover which was raised by a previous owner, and now you are returning it back to the original position, level with the floor. Correct?

Maybe you need pictures and measurements showing how to make an original style cover, is that what you are asking?
 

Mike Perez

Active member
Oct 2, 2019
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43
Working on this too. The floor originally in the cockpit is 1" marine plywood and it is routed at various depths to conform to the structure. The hatch is also 1" marine ply with with the edges routed out for the seal and the middle routed out for the air cleaner clearance. Mine also has a metal plate 1/16th or so above the air cleaner cutout to give it that extra space it needs to clear. I can get you better dimension tomorrow, but if I were you, I'd try to find someone local with a GMC and just take measurements and copy theirs.

Mine had zero insulation. The underside is just exposed wood. I'll be addressing that.
 

tmsnyder

Active member
Oct 7, 2019
485
104
43
Buffalo NY
Hope this helps, first image is the cover right side up. Then upside down . Then a sketch of the hatch upside down. It's a 1" thick piece of plywood, 35 x 30-3/8. Edges have grooves for a rubber seal. And there's most of a 18-3/8 diameter circle cut offset in the cover. Sorry for the messy handwriting, let me know if you can't read it.

20200131_064936[1].jpg20200131_065100[1].jpg20200131_070418[1].jpg
 
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jjdebarros

New member
Oct 30, 2019
26
10
3
Spokane, WA

tmsnyder

Active member
Oct 7, 2019
485
104
43
Buffalo NY
No problem, let me know how it goes! And I noticed a dimension missing which you will need, the location fore/aft for the partial circle hole.
 

Kevin F

New member
Oct 9, 2019
13
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3
What is the best method to replace the existing flooring? Is there a specific rivet or is there another preferred fastener being used instead?