4.3 Exhaust Manifold and Gasket Short Cut

rcmpvet

Seaman Apprentice
Joined
Nov 8, 2015
Messages
45
I've searched this forum and could not find a similar short cut to re-installing the exhaust mainifold to the block with a new gasket. This will of course make the job less daunting when one replaces spark plugs (as I did) and the socket will not go over the plug itslef as the manifold interferes.

Yesterday it took me well over an hour to replace the starboard manifold on the one engine as I am right handed and my left has trouble holding up the heavy manifold with a gasket to be aligned to attach to the block. I was constantly dropping the bolts that you can use to align the gasket. Going home I remembered an old trick from years ago and this morning I was able to install the manifold and gasket, all aligned with all six bolts in about 5 minutes.

Use an elastic band with or without a paper clip, your choice, but with the paper clip I was able to ensure that the band and clip were removed:

Photo #1 - Close up of manifold without gasket.
Photo #2 - Close up of just the rubber band, same is looped over the head of the bolt, bring it over the top of the manifold and hook the other end over the threads of the bolt with the gasket sitting on the bolt and behind the band.
Photo #3 - Use a paper clip, hook the rubber band to the clip and the clip over the bolt, Do this for the two outer ends and once you start the bolts threads you can then remove the clip by pulling down the one end.

No need for gasket sealant, as it is not really called for from what I could find.
 

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Lou C

Supreme Mariner
Joined
Nov 10, 2002
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13,026
No Title

What I did was get some long bolts that were the same thread pitch as the manifold bolts, and cut the heads off. Then I cut a slot in the end in case I needed to use a screwdriver to remove them. Thread them on the front and rear bolt holes. Then slide on the manifold gasket, then the manifold. Now take your manifold bolts (I like to put a bit of permatex aviation sealer on the threads to keep out corrosion) and carefully thread them in, while holding up the manifold just enough to get them to line up. Snug those bolts in. Now remove the 2 long headless bolts, and replace with the regular bolts. Torque to specs and you are done. Save the headless bolts for the next manifold job.
 

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Scott Danforth

Grumpy Vintage Moderator still playing with boats
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Jul 23, 2011
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50,234
two dabs of permatex #3 holds the gasket in place while fitting it.

Felpro marine gaskets come with the last two holes slotted so all you have to do is put the two end bolts in the manifold a few threads into the head, drop in the gasket and then add the other bolts.
 

alldodge

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Mar 8, 2009
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42,543
Use an elastic band with or without a paper clip, your choice, but with the paper clip I was able to ensure that the band and clip were removed:

I like it, it works very well, but

I do have to agree with others, (I'm old and those dang manifolds are heavy) its easier with threaded rod from the hardware store. Even if you don't use gaskets with slots cut in the two outside bolts holes, you can use a pair of diagonal cutters and make the slots
 

Bondo

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Apr 17, 2002
Messages
71,082
Ayuh,.... I'm a fan of the Fel-pro slotted gaskets,....

Great idea though,....
Some motorboxes are to tight to use the headless bolts,....
 

JoLin

Vice Admiral
Joined
Aug 18, 2007
Messages
5,146
Home Depot - a 12" length of 3/8-16 threaded rod costs $2.00. Cut it into a pair of 6" studs. Thread it into 2 of the bolt holes. Hang the gasket, slide on the manifold, screw in 2 of the stock bolts. Remove the studs and screw in the rest of the bolts.

Far as I'm concerned it doesn't get any cheaper or easier than that.

My .02
 
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