Crusader 454 Intake Manifold Gasket Problems....

This forum is for comments and the exchange of information relating to Trojan Boats and boating. Please do not post used parts or boats For Sale in this area. For general, non-boating topics please use our "General Discussions" section.

Note: Negative or inflammatory postings will not be tolerated.

Moderators: BeaconMarineBob, Moderator, BeaconMarineDon

Post Reply
User avatar
Natchamp
Sporadic User
Posts: 175
Joined: Tue Jul 05, 2011 4:05 pm
Location: SoCal

Crusader 454 Intake Manifold Gasket Problems....

Post by Natchamp »

Gents,

Little bit of background....when I started my starboard motor briefly a while back one of the things I did was check the oil and all looked good. The motor only ran for a short period to make sure there were no major problems. Everything was fine.

Now, I'm in the process of cleaning and painting everything. During that process I drained the oil and I noticed the oil appeared to have water in it. It was that mocha coffee brown and was very thick. That tells me water. The perplexing part is that there were no signs of this from when I started my motor before. But I can see how it could happen since this thing has been sitting for so long and when I started it up that's when the problem could have surfaced.

I've read about the problems of the water cross-over passages rusting on these so I investigated a little bit. Everything looked fairly decent but when I simply touched the intake gasket around the cross-over area the gasket broke off very easily because it was so dried out. I removed some of the gasket as you can see in the pics below and was surprised to find a rather large orifice. These holes are simply covered up by the gasket. There can’t really be any sealing effect because there is nothing on top of the gasket at this point. The gasket just covers the hole. I’ve played around with Chevy v-8’s before and have never seen this or an intake manifold that doesn’t cover the entire head surface.

These holes appear to be blind and do not go anywhere. They are just part of the head casting for some reason but they do not go down into the valley or anywhere.

My question is, does this look right? I plan on installing a new intake gasket. I’m thinking that since the gasket was so dried out the high probability is the sealing aspect of that cross-over is severely compromised. What say you?

Image
Image

koviak
Moderate User
Posts: 242
Joined: Sun Sep 28, 2008 8:53 pm
Location: Pasadena Md

Post by koviak »

This is where you mount a divorced choke for Qaudrajet carbs. Does not cover the opening but mounts in front of it to intake manifold. As engine heats spring turns taking choke off. On my old mopar marines I blocked them off for a slight performance increase.
Dennis
1989 10 Meter Mid-Cabin

rossjo
Ultimate User
Posts: 2801
Joined: Tue Nov 08, 2005 2:48 pm
Location: Charleston, SC
Contact:

Post by rossjo »

Summit or Jegs sell a plate to block it.
Captain Ross, 2009 Trojan Boater of the Year
"Viva Mahia" F32 Cummins 6BTA diesels,
"Mack Attack" Chaparral 244 Fish, SeaPro 180, McKee 14, Montauk-17
Image

User avatar
Natchamp
Sporadic User
Posts: 175
Joined: Tue Jul 05, 2011 4:05 pm
Location: SoCal

Post by Natchamp »

Thanks guys, but I'm not referring to the choke mount. I know what that is :) I'm talking about the passage/hole on the heads. The pictures are from each side/head.

User avatar
BobCT
Active User
Posts: 1029
Joined: Mon Sep 07, 2009 9:01 pm
Location: New Haven CT

Post by BobCT »

I remember that when I changed my intake gasket a couple of years ago. I'm pretty sure the new gasket will block off that area...

I seem to remember some metal built into the gasket which was the same shape as this area.


Bob
1988 10m mid cabin

User avatar
prowlersfish
2021 Gold Support
2021 Gold Support
Posts: 12376
Joined: Sat Nov 05, 2005 6:56 pm
Location: Lower Chesapeake Bay ,Va

Post by prowlersfish »

:arrow:
Boating is good for the soul
77/78 TROJAN F36 Conv.
6BTA Cummins diesels
Life is to short for a ugly boat :D

User avatar
Mike Kulp
Moderate User
Posts: 234
Joined: Mon May 16, 2011 4:53 pm
Location: Upper Chesapeake Bay/Middle River
Contact:

Post by Mike Kulp »

My Crusaders are basicly the same way and have been this way for years with no problem, I do think new gaskets will cover this opening but really do not seal it. The thing I am wondering is where did the water come from, I would check risers and elbows if theye are compromised the water could leak down the exhaust manifold into a cylinder and then the crankcase, is the engine raw water cooled possibly exhaust manifold, does it have a engine oil cooler, and possibly intake gaskets or head gaskets. Hope it is something easy.
Mike 1986 10 Meter mid cabin

mrhodgie
2021 Gold Support
2021 Gold Support
Posts: 2
Joined: Fri Feb 07, 2020 9:49 am

Re: Crusader 454 Intake Manifold Gasket Problems....

Post by mrhodgie »

I rebuilt my port 454 crusader 3 years ago and now my center ports are burning through and are opening up as yours have.. and now have an exhaust tick.. no water and shouldnt have.. you probably have an issue with you exhaust manifolds..ive been advised to use the crusader part# 30221 gasket set (ebay).. which i didnt use on the rebuild.. my starboard has 1500 hrs and has a very slight sign of burning after 12 years of use so i think with proper install (torqing) they will be fine.. hope that helps

User avatar
prowlersfish
2021 Gold Support
2021 Gold Support
Posts: 12376
Joined: Sat Nov 05, 2005 6:56 pm
Location: Lower Chesapeake Bay ,Va

Re: Crusader 454 Intake Manifold Gasket Problems....

Post by prowlersfish »

He sold that beautiful 10 Meter years ago. Good info
Boating is good for the soul
77/78 TROJAN F36 Conv.
6BTA Cummins diesels
Life is to short for a ugly boat :D

kallen
Sporadic User
Posts: 118
Joined: Wed Jun 04, 2008 8:48 pm
Location: Ivy lee, ontario,canada

Re: Crusader 454 Intake Manifold Gasket Problems....

Post by kallen »

Have the intake checked for trueness. A machine shop will be able check and machine the flange surface.

Post Reply