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Board index » All Posts (dmarrin)




Re: 327ci mystery
#1
Just can't stay away
Just can't stay away

Dan Marrin
Pepepackard; At the suggestion of PackardDon I had planned to leave both manifolds bolted together at the heat exchanger and have them machined together as an assembly. The eight nuts holding the manifolds to the block came away surprisingly easily but I fear I may have to cut the two bolts that connect the exhaust manifold to the exhaust pipe. I assume a machine shop can back the remainder if the bolts from the manifold casting?

Posted on: 2019/6/23 16:31
Dan Marrin
Summers; Breezy Point, MN, Winters; The Villages, FL
'48 Sup8 conv, '48 Sup8Del LWB sed, '58 Hawk.
 Top 


Re: 327ci mystery
#2
Just can't stay away
Just can't stay away

Dan Marrin
PackarDon: thanks for the advice. Are the two manifold actually connected to one another? If I take them to a machine shop to be milled, can I assume that the block is straight and true? I'm assuming I may need a lot of PB Blaster to free up some of the exhaust connectors. I ordered a three piece gasket set. Are there any sealers required to be applied during installation and is there a tightening sequence or torque specification to be mindful of?

Posted on: 2019/6/15 21:14
Dan Marrin
Summers; Breezy Point, MN, Winters; The Villages, FL
'48 Sup8 conv, '48 Sup8Del LWB sed, '58 Hawk.
 Top 


Re: 327ci mystery
#3
Just can't stay away
Just can't stay away

Dan Marrin
Mystery solved, thanks to Dave, Tim and 50 2382 who all suggested the spraying of something onto the gasket area of the intake manifold to block connection. When I sprayed the Gumout on that connection the idle smoothed right out. So this leak is evidently the culprit for both my low vacuum readings and the failure of 7&8 to fire. Glory Hallelujah.

Now for some guidance on what to do to replace the gaskets. Can I remove just the intake manifold, will I have to wrestle with the exhaust manifold as well. There appear to be eight nuts that must be removed to release the manifolds plus a lot of auxiliary connections. Can I replace just the intake gaskets?

Thanks to all for your help. I'm almost home free, but not quite yet.

Posted on: 2019/6/15 13:53
Dan Marrin
Summers; Breezy Point, MN, Winters; The Villages, FL
'48 Sup8 conv, '48 Sup8Del LWB sed, '58 Hawk.
 Top 


Re: 327ci mystery
#4
Just can't stay away
Just can't stay away

Dan Marrin
Tim, thanks for your thoughts. Dave Czirr suggested a while back that I spray oil along the manifold to block connection in an attempt to perhaps seal the connection and improve performance. This approach did not produce discernible improvement, but your suggestion to introduce a flammable substance to that area might give a more pronounced effect, assuming there is a gasket leak. A leak on the rear intake gasket would certainly explain the lack of contribution from those last two cylinders.

What should I expect to see when doing a running compression check on cylinders 7 and 8, and how should I interpret the readings?

Posted on: 2019/6/15 10:17
Dan Marrin
Summers; Breezy Point, MN, Winters; The Villages, FL
'48 Sup8 conv, '48 Sup8Del LWB sed, '58 Hawk.
 Top 


Re: 327ci mystery
#5
Just can't stay away
Just can't stay away

Dan Marrin
I'm making some headway hopefully toward a solution

I've verified that wires from the distributor to the plugs are indeed in the correct firing order.

I have blocked the vacuum line to the wipers with no improvement to the low idle vacuum, so there is no leak there.

I have also blocked the vacuum line for the carburetor to the vacuum advance. No improvement there either.

I have yet to find an additional plug hole anywhere beneath the intake manifold, but I just purchased an inspection camera that may allow me to investigate the bottom of the intake manifold, and in addition allow me to examine the back portion of the intake manifold from the inside where it meets the 7 and 8 cylinders. Wish me luck.

Any additional theories are most welcome

Posted on: 2019/6/14 18:33
Dan Marrin
Summers; Breezy Point, MN, Winters; The Villages, FL
'48 Sup8 conv, '48 Sup8Del LWB sed, '58 Hawk.
 Top 


Re: 327ci mystery
#6
Just can't stay away
Just can't stay away

Dan Marrin
Tim: I believe my windshield wipers are plumbed to the auxiliary vacuum pump on top of the fuel pump, but I will verify this tomorrow. Still worth a try to block that hose to see if there is any improvement in the vacuum.

Howard: I was not aware that there might be an opening somewhere beneath the intake manifold. I'm very interested to pursue that possibility.

Ernie: I'm getting a strong spark to both the 7 & 8 plugs, but I will double check the distributor cap to see it there are any abnormalities.

Thank you all for your suggestions.

Posted on: 2019/6/12 20:24
Dan Marrin
Summers; Breezy Point, MN, Winters; The Villages, FL
'48 Sup8 conv, '48 Sup8Del LWB sed, '58 Hawk.
 Top 


Re: 1948 Super Side View Mirrors
#7
Just can't stay away
Just can't stay away

Dan Marrin
Here are a couple of photos of the left and right mirrors on my '48 Super Eight Victoria convertible showing their mounting position in relation the the front leading tip of the stainless steel trim piece over which they are mounted.

Attach file:



jpeg  (198.61 KB)
364_5d019ecc9c162.jpeg 2048X1536 px

jpeg  (178.28 KB)
364_5d019ee1aac7a.jpeg 1920X1440 px

Posted on: 2019/6/12 19:56
Dan Marrin
Summers; Breezy Point, MN, Winters; The Villages, FL
'48 Sup8 conv, '48 Sup8Del LWB sed, '58 Hawk.
 Top 


Re: 327ci mystery
#8
Just can't stay away
Just can't stay away

Dan Marrin
Thanks, Dave, for hanging in there with me on this one. The number 1 and 2 cylinders appear to be firing normally, as the engine stumbles when either of these is shorted out. However when I short out either number 7 or 8, no discernable change in the idle. I was pulling the plug wires off the plugs before, rather than shorting them out, and assume that the effect is identical? It's almost as though something is blocking the gas/air mixture from reaching the 7 & 8 cylinders, and the vacuum from those two cylinders from reaching the intake manifold; does that make sense? If so, what step could I take to check or remedy that?

Thank you 50 2382 for your directions on how to check the vacuum advance. I'll also check all the plug wires to confirm that the firing order is correct!

Posted on: 2019/6/12 15:46
Dan Marrin
Summers; Breezy Point, MN, Winters; The Villages, FL
'48 Sup8 conv, '48 Sup8Del LWB sed, '58 Hawk.
 Top 


Re: 327ci mystery
#9
Just can't stay away
Just can't stay away

Dan Marrin
Dave: I assume that you wanted me to remove each of the 7 k 8 cylinder plugs one at a time and verify that they were each firing on the business end when the engine was running. I did just that and both were sparking at the electrode. Engine sounds like a Model T when running with a plug removed.

I wasn't quite sure how to see if the vacuum advance was functioning properly?

Posted on: 2019/6/11 15:42
Dan Marrin
Summers; Breezy Point, MN, Winters; The Villages, FL
'48 Sup8 conv, '48 Sup8Del LWB sed, '58 Hawk.
 Top 


Re: 327ci mystery
#10
Just can't stay away
Just can't stay away

Dan Marrin
Thank you for your responses. I will check the vacuum advance and try to verify that the 7&8 plugs are actually firing.

Posted on: 2019/6/10 16:51
Dan Marrin
Summers; Breezy Point, MN, Winters; The Villages, FL
'48 Sup8 conv, '48 Sup8Del LWB sed, '58 Hawk.
 Top 



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