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Here we go again...


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Started a couple of weeks ago. Rear head is leaking coolant into the V. Haven't made up my mind as to whether I want to do it myself or hire a shop. If I do it I know it will be done right.

I'm fairly well experienced at such things - tech school, worked as a tech, head gaskets, head and engine rebuilds and many other projects. I know my way around cars...

If I do it I'll do it with the engine in the car in the car, just don't know if I want to undertake this project.

You fellas who've timeseted the engine in the car I seek your advice...

Everyone else please feel free to opine.

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I am sure that KHE (kevin) will chime in here, but here is his recent thread for you to look over. http://caddyinfo.ipbhost.com/index.php?sho...ic=9085&hl=

Some very knowledgable time-serters contributed to his thread. We have had a couple of members do the job with the engine in the car (Barry94?). Good Luck

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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If you search the archives you will find a lot of information on this topic. It typically costs over $2K to time-sert a Northstar engine. Here are a couple of links that may be of some assistance.

Cadillac Northstar time-sert repair of Head Bolt Threads

Head Gasgets and Time Serts, Archive pointers

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Before I ripped the engine open, I would make sure that the head gasket is leaking - many times, coolant into the "V" area of the engine is due to die checking/porosity in the casting. If that is the case, the leak will not hurt a thing and a dose of the sealer pellets will clear it up.

Remove the intake manifold and pressurize the cooling system with a tester and positively identify the source of the leak before jumping to the conclusion that the head gasket is bad.

'93 Fleetwood Brougham
'05 Deville
'04 Deville
2013 Silverado Z71

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