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Cooperative Motor Works

Vintage RV & Motorhome restorations - "The GMC Coop"

You are here: Home / The Daily Pose / GMC 455 motor breakdown

February 23, 2016

GMC 455 motor breakdown

To you early risers like me I have to apologize, right now my morning schedule is to pick up Manny and Cal and I hit DixieBelle for breakfast.  Not early risers I do understand and must accommodate which of course puts me a little behind in my morning ritual of talking to you guys… like I said.. sorry bout that chief…

This weekend a broke down a 455 motor for a rebuild to our roller cam rebuild.  Though I would show you what that’s about.  I started off with a good running motor, some of you might say “why take apart a good running motor”?  Think about that, if you want to be more sure that a 40 something year old motor will service you well, the only way is to build it up.  Sorry but here you are putting all that into the body and interior but still have an old motor?   Be sure you also have AAA Plus, a cell phone and a charge card.  You just can’t tell when something might happen.  Even rebuilding an old motor you still have a certain amount of Murphy hanging around so putting the best foot forward you can is important.

OK, opening up this motor, the intake and valve covers come off first Motor-breakdown-9.You can see from the rusty metal at the middle of the intake that the exhaust crossover has heated things up pretty good.  One unique thing about our “concave” intakes are the exhaust heats things up too much.  Looking into the valley pan with the intake off you can see the damage from this exhaust crossover Motor-breakdown-8  This valley pan or “turkey tray” for you southerners will not be replaces when blocking that hot air from the intake on reassembly.  Removing the turkey tray you can see this motor is really clean Motor-breakdown-7 and in great shape.  The heads off you can see good valve color and again a clean motor Motor-breakdown-3Motor-breakdown-4  Now for the bottom end we flip the motor over and remove the oil pan Motor-breakdown-6  and that’s when I forgot to take more pick.  I tell ya though, this is a great core to build up… no failure trauma and clean.  Gor a shot unleading the pices … parts at the machine shop where their journey begins Motor-breakdown-2 and yeah, that’s a good looking crank too.  Just a little cleanup and 10 over will give us a reliable bottom end.  Guys really, if you know your motor is weak, burning a little too much oil and all that … if you want to keep your coach running and doing what you want… you really may want to have your good core rebuilt BEFORE something happens.

The parts will be at the machine shop @ 4 weeks, parts ordered then Drew our building will assemble it all for testing.  Stay tuned and watch how that goes.

OK guys, at least I did get a thought out this morning.. a little late but it’s done.  My guess is tomorrow I’ll again be a little late so sleep in… we’ll see ya tomorrow….

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Article by jimbounds / The Daily Pose

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