Re: {Chrysler 300} Re: 300B Stumbling at 60+ MPH

On Tue, Aug 15, 2023, 12:41 PM John Grady <jkg@xxxxxxxxxxxxxxxxx> wrote:

the aluminum tube IS the gasket .
but if two gaskets it may back the plug up a few turns exposing the bottom threads to carbon . And fouling them .
Then the right plug might drop chunks into engine .
might …

Sent from my iPhone

On Aug 15, 2023, at 11:21 AM, Henry Schleimer <henry.schleimer@xxxxxxxxxxxxxxx> wrote:

I am forwarding this to the Club because my response to Ray got bounced by his server. Probably thinks I am spam! Hopefully he can read this through the Club.

I really don’t want any more corro on this. I didn’t design the engine. Please just buy a Service Manual.

Henry

From: Henry Schleimer [mailto:henry.schleimer@xxxxxxxxxxxxxxx]
Sent: Wednesday, 16 August 2023 12:59 AM
To: 'Ray Melton'
Subject: RE: {Chrysler 300} Re: 300B Stumbling at 60+ MPH

Hi Ray

Don’t shoot the messenger! The engineers who designed the engine thought it was important enough to write the instructions in BOLD in the service manual. If you still aren’t convinced “The Complete Chrysler Hemi Engine Manual” also states the tubes were designed to fit onto the spark plugs without gaskets.

I took mine off with wire cutters or pliers, I forget. No big deal, takes five minutes and no damage. The aluminium face at the end of the tube could get smeared/distorted because the contact area is smaller than the shoulder of the plug. The soft crush ring as you call it is harder than the aluminium tube. Of course the engine will work. But he will probably get oil in the tubes. Had that on my V6 Mitsubishi and it isn’t pleasant.

Henry

From: Ray Melton [mailto:rfmelton@xxxxxxx]
Sent: Tuesday, 15 August 2023 1:53 PM
To: Henry Schleimer
Subject: Re: {Chrysler 300} Re: 300B Stumbling at 60+ MPH

Hello Henry -
Too late - he's already installed the new plugs - and the car runs great! The "gasket" (actually a soft metal crush ring) on most modern spark plugs is NOT easily removable and would have to be cut off like with a Dremel tool, inevitably damaging the sealing surface on the plug. How could that slightly crushable ring damage the long aluminum tube?
Ray Melton 1957 300C cvt
*******************************************
On 8/14/2023 8:45 AM, Henry Schleimer wrote:
I see a gasket on the spark plug. At least in the 57 Service Manual it clearly states in bold “No gaskets are used on double rocker shaft engines.” You should check your 56 manual. The gasket will damage the spark plug tube. Better check the new spark plugs you put in as well as the tubes.

Henry

From: chrysler-300-club-international@xxxxxxxxxxxxxxxx [mailto:chrysler-300-club-international@xxxxxxxxxxxxxxxx] On Behalf Of BRIAN WALKER
Sent: Monday, 14 August 2023 4:41 AM
To: Henry Schleimer; 'John Grady'; 'John Cote'
Cc: 'Justin I'; 'ridgleyracing65'; 'Chrysler 300 Club International'
Subject: Re: {Chrysler 300} Re: 300B Stumbling at 60+ MPH

Hello everyone and thanks for all the insightful suggestions. The solution ended up being a simple one, changing out my spark plugs. Something I should've done anyway and probably long ago. See attached pic for how bad of shape they were in.

Yesterday I tested my 300B on the highway & it shot up to 85 mph like a rocket!

Thanks,

Brian

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From: chrysler-300-club-international@xxxxxxxxxxxxxxxx <chrysler-300-club-international@xxxxxxxxxxxxxxxx> on behalf of Henry Schleimer <henry.schleimer@xxxxxxxxxxxxxxx>
Sent: Friday, August 11, 2023 10:40:00 AM
To: 'John Grady' <jkg@xxxxxxxxxxxxxxxxx>; 'John Cote' <cotejohnr@xxxxxxx>
Cc: 'Justin I' <captjj28@xxxxxxxxxxx>; 'ridgleyracing65' <ridgleyracing65@xxxxxxxxx>; 'Chrysler 300 Club International' <chrysler-300-club-international@xxxxxxxxxxxxxxxx>
Subject: RE: {Chrysler 300} Re: 300B Stumbling at 60+ MPH

Another thing easily checked is your vacuum advance. As you say this happens with throttle input, that’s when you get vacuum change. First put a vacuum gauge on the line from the carb and see that the vacuum changes when the engine is revved. Then apply a had held vacuum pump to the canister and watch for proper timing change as the vacuum increases. I know you said the distributor was gone over but a sticking vacuum advance will give those sorts of symptoms.

Best of luck.

Henry

From: chrysler-300-club-international@xxxxxxxxxxxxxxxx [mailto:chrysler-300-club-international@xxxxxxxxxxxxxxxx] On Behalf Of John Grady
Sent: Friday, 11 August 2023 11:08 PM
To: John Cote
Cc: Justin I; ridgleyracing65; Chrysler 300 Club International
Subject: Re: {Chrysler 300} Re: 300B Stumbling at 60+ MPH

really good suggestion ! I forgot about all that . new ones are truly junk if they have a black robber cone on end , a stamped in X or stamped line on other end . It is supposed to hold aluminum foil against the aluminum case inside by pressing in . The design is a sad brutally incompetent joke. Gets intermittent contact due to aluminum oxide .You can’t touch aluminum together and expect a connection Skip , poor running comes and goes . Hard start etc .
This drove me crazy for years , finally one day I had exact same issue on Kohler flat twin emergency plant , sometimes no start . . After cutting one open —— that one day it tested good another day bad , (open) i saw where it had been arcing , not even sealed . I’d say good for under a year ,total junk .
I got so into it big time ; I mounted panasonic radio quality capacitors instead , .27 uF 630V as you can’t find good automotive ones .All about making it in China for 5 cents. The Panasonic are epoxy sealed , Japanese quality control . By the way , all interchange .

People routinely throw out really good old mopar hermetically sealed ones with the copper strap , replace with chinese junk with the rubber cone. Private branded , as part of “ tune up “
Check cap with highest scale ohmmeter analog , needle swings up settles at infinity it is good don’t change out as “ part of time up” unless bad .
I have never seen a bad mopar with copper strap ,or blue streak with strap either .
watch for them on ebay , I found 10 one time .
Failing to understand this leads to changing plug wires plugs and coil , each makes it better for a month , as spark is on edge weak (sometimes ) due to poor contact inside the cap

Sent from my iPhone

On Aug 11, 2023, at 8:25 AM, 'John Cote' via Chrysler 300 Club International <chrysler-300-club-international@xxxxxxxxxxxxxxxx> wrote:

Try changing just the condenser in distributor. Same symptoms you have. Worked for me and ran without stumbles after changing. Easy to try before going down rabbit hole. 🤔
Sent from my iPhone

On Aug 10, 2023, at 7:16 PM, Justin I <captjj28@xxxxxxxxxxx> wrote:

I am still having the opposite problem: stumbling with throttle input from any speed. Distributor/timing, fuel... all gone over. Wondering if it could be slack in timing chain... ? Maybe the harmonic balancer has slipped and is no longer reading accurate time, but runs nice once the stumbling clears.

Hard starts when warm, but I think that's just heat soak; not necessarily a related issue.

-Justin

From: chrysler-300-club-international@xxxxxxxxxxxxxxxx <chrysler-300-club-international@xxxxxxxxxxxxxxxx> on behalf of ridgleyracing65 <ridgleyracing65@xxxxxxxxx>
Sent: Sunday, August 6, 2023 6:46 PM
To: Chrysler 300 Club International <chrysler-300-club-international@xxxxxxxxxxxxxxxx>
Subject: Re: {Chrysler 300} Re: 300B Stumbling at 60+ MPH

Brian:

If you know the exhaust is good, then I am back with the other members pointing toward a fuel supply issue.

Dyke Ridgley
On Sunday, August 6, 2023 at 5:08:56 PM UTC-5 bwalk05 wrote:
Hi Dyke

The exhaust & mufflers were some of the first things I replaced. So both are brand new.

Thanks,

Brian

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From: chrysler-300-cl...@xxxxxxxxxxxxxxxx <chrysler-300-cl...@xxxxxxxxxxxxxxxx> on behalf of ridgleyracing65 <ridgley...@xxxxxxxxx>
Sent: Sunday, August 6, 2023 2:44:39 PM

To: Chrysler 300 Club International <chrysler-300-cl...@xxxxxxxxxxxxxxxx>
Subject: {Chrysler 300} Re: 300B Stumbling at 60+ MPH

This has all the indications of a partially plugged exhaust system. How old is the exhaust and mufflers? Car idles and runs great up to the point the exhaust restriction just stops the performance. I have seen this exact same thing before.

Dyke Ridgley
On Saturday, August 5, 2023 at 11:15:03 AM UTC-5 bwalk05 wrote:
Hello Everyone,

Anyone have any suggestions for troubleshooting Carter adjustments (or otherwise) for a car that stumbles beyond 60 mph. It starts up fine, idles smooth, accelerates strong up to 60 mph and then stumbles...even at fully open throttle.

I suspect there is an accelerator pump issue or secondary is not opening under vacuum. Any thoughts/suggestions would be greatly appreciated!

Thanks,

Brian W.
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