Chrysler 300 1966 440 engine

[PP1RT]

Valve job was not done right. Smokes when you let off the gas.

 

[69a100]

What's the story and anything going on with the 66-300????

 

[PurpleBeeper]

Thats one thing i noticed when i had the drivers side valve cover off. No rubber valve guide boots. I thought that was normal to have those in place but none of the valve stems have those. I never checked the pass side though. I will post the reciepts and info tonight as well.

Holy Crap! That might be your problem. On a stock-type motor, you should have one of these on every valve stem (inside the valve spring). Some people call them "umbrella seals"

You should have one of these "inside" each valve spring.

You get them out with a special adapter & compressed air running into the spark plug holes (with the piston up on that cylinder) using one of these tools

You have to look "inside" the valve springs to see them. They cost about $25-$35/set for the whole engine. They keep oil from going down into the cylinders, causing the engine to smoke out the tail pipes. They do get old & cracked (or forgotten!). IF you're missing these, that might be your only problem. Any cylinder that was missing at least one (they're on intake & exhaust valve) would have oily looking spark plugs & you'd be blowing black smoke out the back from the oil you'd be burning.

They are normally replaced during a valve job. You can do this easily with the heads off the engine, but with the heads ON the engine, you need the spark-plug-hole compressor trick..... but MUCH easier than taking of the heads. Maybe a shop can do it for you?

 

[slimt]

Ya those umbrella boots are not there. None of the stems have those. The 66 300 i might just buy as a driver .

Ill give you all a update tonight afterwork. Im stuck in a paint booth right now 108 f all day in there. Unbarrable.

 

[SublimeSixpack]

Holy smoke. Someone did head work then left the valve seals off?

 

[HEMI-ITIS]

There is a step by step diagnosis to follow to determine just what needs to be done.

 

[miller]

Only 3000 miles on the work, didn't realize that.
But, from what's come out on the guide seals, I'd pull the heads, check everything, and add on the seals. With no seals installed, gotta wonder what else wasn't done!

 

[HEMI-ITIS]

If you follow the order of diagnostics,if the valve stem seal is the problem,they can be replaced without removing the cylinder heads if the budget is tight,otherwise I would go through the entire engine!!

 

[slimt]

Thanks guys. Ill be following all that you have said. From the compression tests first checking the plugs hopefully the seals are the issue and the only issue. If not i have no problem in getting this checked out and worked on by a reputible mechanic.
Moneys not a issue on old mopars.
Thank you

 

[slimt]

Question these valve stem seals do they fit snug to the bottom or do they go up and down with the valve stem?

 

[62MAX]

Question these valve stem seals do they fit snug to the bottom or do they go up and down with the valve stem?

Here is your answer .

http://www.felpro.com/technical/tecblogs/valve-stem-seals.html



http://www.felpro.com/technical/tecblogs/valve-stem-seals.html

 

[slimt]

Here is your answer .

http://www.felpro.com/technical/tecblogs/valve-stem-seals.html

Thank you.

 

[moper]

There ar different types of seals. Umbrella, which is used in earlier engines on both valves, but on later (mid 70s-up) engines have umbrella on the exhaust and what is shown on the intake. Then there are positive type seals which are required for dual valve springs, and require the guides to be machined down. Those can be gold, or white, or blue depending on the manufacturer and seal material. Regardless of design, the engine MUST have valve seals and leaking or missing ones will smoke like mad at startup and high vacuum throttle positions.

 

[moper]

In regard to swapping or fixing - I'd fix the 383 that's matching, then if you want to go bigger, think about storing it and getting a bigger one.

 

[slimt]

Well i installed 16 seals. Not out of a gasket set. I was able to go to a place called mopac the specialize in race car goods. I got a set of tall umbrella seals. 9 hours later all in and back to gether. Ill take it out today and see if any thing changed.
I think i should of got the other style that clamp to the guide and wipe the oil from the stem.
I will do a compression test today. I have to get the reciepts out from the rebuild to see exactly what was done. I will post the findings. Thanks for the valueble info it made this a good experience for me
Much appreciated.

 

[slimt]

Thanks .. Took it for a run. No smoke. Thank you.

Noticed something else though. New thread . Transmission leaks from the inspection plate area. Got to fix that. Nothing worse than burning off the exhaust tranny fluid

 

[BeeKool]

Something else to keep in mind. If the piston rings are in poor shape, there's a good chance the bearings are getting that way, too.
Only one cure...complete overhaul...and be done with it.

X2. Not to mention the cam and valvetrain

 

[slimt]

Oh the engine is coming out in the fall it will be gone through. I dont trust what ive seen so far. Ill get it takin care of the proper way.

 

[PurpleBeeper]

Thanks .. Took it for a run. No smoke. Thank you.

Noticed something else though. New thread . Transmission leaks from the inspection plate area. Got to fix that. Nothing worse than burning off the exhaust tranny fluid

Boo-Yah! Glad to hear it!

 

[patrick66]

Rebuild the 383 and keep the Charger right! I hate when a C-body is seen as nothing more than an organ donor. In your case, this essentially ruins two nice cars.