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6.2L Diesel 1982-93 6.2L Diesel - Member access forum for any questions or information exchange related to the 6.2L engine.

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  #1  
Old 04-06-2017, 12:33 AM
shawnjo6565 shawnjo6565 is offline
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Default 6.2 Valve Cover Gasket Replacement

I have a 1982 GMC K3500 6.2 and I need to know how to replace the valve cover gaskets.
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  #2  
Old 04-06-2017, 07:36 AM
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Missy Good Wench ( Moderator)
 
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Location: Newberg Oregon
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The 6.2/6.5 do not use gaskets.

The covers are sealed with a high temp silicone sealer (Gooooo in a tube)

Procedure

Remove the intake manifold (Unhook wires, throttle cables etc)
*** NOTE***
Coolant crossover stays in place and there will be no leaks when removing manifold

Carefully clean the intake port area of old gasket and protect against dropping junk in the ports.

Cover ports with Duct tape while working on the area.

Mark each injector line PAIR with tape 1-3 ... 5-7 2-4... 6-8
Label them

Make a carewful map of where they connect to the IP and in what order.

Remove the small sheet metal screws holding the line clamps to the Valve covers.

Remove the nuts the hold the line clamps at the manifold bolts (Usually when you remove the intake.

Loosen the injector lines from the injectors (Cover the injector fitting to keep out junk)

Loosen the line fittings at the IP *** A 3/8 drive crow foot works well for removing the injector lines at the IP ***

Cover the Fittings of the IP with a clean shop towel

***Before removing lines use a shop vac a clean the valley area of debris ***

With the lines off you can carefully unbolt and remove the Valve covers.

Use a thin sharp putty knife to slide in between the head and cover to help cut the silicone goop.

DO NOT GET ROUGH WITH THE COVERS AS THEY ARE THIN AND CAN BE TWEAKED EASILY

Clean all the goop off the cover sealer area and then lay the cover on a flat steel surface and tap down any spots where the bolt area has been distorted.

The covers need to be very very clean in the area where the goop goes.

Clean off the head area where the cover fits.

Once cleaned of old goop, wipe the area well with a rag soaked in BRAKEKLEEN to remove all oil traces

THESE AREAS MUST BE CLEAN, OIL FREE AND DRY.

Apply high temp black silicone goop to the seal area of the cover (1/4 inch thick and be sure to cover the entire area that contacts the head flange.

Carefully sit the cover on he head and install the bolts.

Lightly snug the bolt (LIGHTLY)

Let the goop cure over night and then snug the bolts on to full torque.
(Snug with a short wrench)
Do not over tighten

Reattach the lines and the parts you removed.

First start is a bit tough.

Remove glow plugs and spin engine until fuel mist appears.

Replace plugs and start normally

*** This maneuver makes getting the air purged from the injector lines far easier on the starter, batteries and your patience ***


DO NOT BE TEMPTED BY THE DARK SIDE

Do not bend the injector lines to make the job quicker
Do not use gaskets,... they will leak


Good luck
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  #3  
Old 04-06-2017, 08:12 AM
Dvldog8793 Dvldog8793 is offline
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Howdy
IMHO....the best "goop" on the market BY FAR, is a product called "The Right Stuff", it works great! just follow the directions as it is different than standard "goop"
Good Luck!
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  #4  
Old 04-06-2017, 05:50 PM
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Missy Good Wench ( Moderator)
 
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X2
Right stuff is great.
Little more $$$ but great stuff.
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  #5  
Old 07-30-2017, 07:35 AM
shawnjo6565 shawnjo6565 is offline
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Location: Basin, Wyoming
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Default 6.2 intake manifold torque specification and tightening sequence

I am at the final on this and need to know what the torque specification and tightening sequence is.
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