Re: engine guys...Valve seals?
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Home away from home
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I'm assuming u have only driven the car less than 200 miles.
The best thing to do is try to get about 500 or more miles on the engine (good long warm runs at 50+ mph) before u attack any of the engine. Most likely the rings have siezed in the pistons and a good long hot run will help to loosen them over time.
Posted on: 2008/9/14 21:53
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Re: engine guys...Valve seals?
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Home away from home
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Ive burned off a tank and a half cruising at 45-55 (broken speedo) mostly on the local highway Rte 1. I did "break in" the engine after its long sit with gentel back roads and subdivisions.
Posted on: 2008/9/14 21:57
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Daily Driver:
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Re: engine guys...Valve seals?
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Forum Ambassador
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They are replaceable. The originals on my car were all cracked, missing or hard as rocks. Machinist did a bit of work to end of guide to fit modern type and replace.
Posted on: 2008/9/14 22:00
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Re: engine guys...Valve seals?
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Home away from home
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HH56, what do you mean by 'modern' ones? are origanals availible?
Posted on: 2008/9/14 22:04
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Daily Driver:
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Re: engine guys...Valve seals?
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Home away from home
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There are TWO different valve seals on the V8's from the factory. There is a vulcanized (or similar process) kind of O-ring seal on the valve spring collar. And an umbrella type on the stem.
Posted on: 2008/9/14 22:12
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Re: engine guys...Valve seals?
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Forum Ambassador
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I'm sure they are but originals were rubber and modern type he used (don't remember what they were for but think GM} were a synthetic material and not prone to the cracking and drying and heat supposedly. One thing to check also is if the baffles are in place. They were added in mid production to keep excess oil from landing on the stems. If missing, could also be contributing (with combination of bad seals) to the problem. See Jan, 56 service counselor.
Posted on: 2008/9/14 22:16
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Re: engine guys...Valve seals?
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Home away from home
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Thanks! I will see what happens tommorow with the test drive. are either of these seals availible, or is there a cross reference to a new type?
Posted on: 2008/9/14 22:17
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Daily Driver:
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Re: engine guys...Valve seals?
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Home away from home
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Try this:
Pull one valve cover off. Start the engine and look to see how much oil is getting to the stems. Probably not much or closer to NONE. Then take it for a 5 or 6 mile test run at 60 - 70 mph and report back how much oil ever leaves the trough of the head. I doubt that barely 5 or 6 drops of oil will ever hit the windshield or ANYWHERE outside of the head. BEFORE u start the engine look at the stems to see how wet or dry they are. Look at them again after a test run. I think u will find that they are running dry as a bone. Will probably also find about .007-.009 valve stem clearance too when u remove the springs to replace the seals. I don't know what replacements of original are available. Would NOT use the CUP shaped Umbrel;la types. On my 56 352 i used a MoPar WIDE SHALLOW umbrella type seal that rides on the valve stem. No seal on the collar only because they were not avilable at that time or i couldn't locate any.
Posted on: 2008/9/14 22:31
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Re: engine guys...Valve seals?
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Home away from home
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Hi, Mike,
Valve stem seals are unlikely to be your big problem. A valve stem seal oil burning doesn't come and go. Smoke from a missing valve stem seal will be present a bit upon deceleration and a lot upon acceleration after a decel. Closing the throttle at speed creates a very high vacuum. Oil is sucked past the valve guides. Opening the throttle, the cylinders are coated with oil and it burns and smoke is visible. Missing seals will smoke a bit on steady high-vacuum cruise. 1. Is the smoke definitely blue? Black smoke can be a stuck choke, stuck carburetor float, ignition problems. 2. If the smoke is definitely blue, there are only two ways for oil to get into a stock Packard: a. Valve stem seals, but this symptom doesn't get worse and better randomly. b. Something mechanical, such as stuck/broken rings, cracked piston. 3. A few Packards from California had PCV valves installed on the. Often this was not done correctly. Often, it was not maintained. Check for any vacuum line going into the intake manifold. This includes a power brake system. Not common on Packards, but one owner of another brand was chasing an oil burning problem while his brake fluid was going out the tailpipe. 4. Head gasket. When a head gasket fails, at high temps antifreeze can be sucked into the chamber and whiter smoke insues. Check the coolant level. thnx, jack vines
Posted on: 2008/9/15 10:26
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