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Board index » All Posts (1941_180)




Re: 1941 Packard 356 8 cylinder - Low Vacuum After Rebuild
#1
Quite a regular
Quite a regular

hynesjm
Thanks for the ebay listing. I currently have installed and another set of the ~4 port interconnected Metal Faced/paper gasekts that seem to be advertised for the later 8 cylinders.

I ordered copper ring gaskets that are individual and have a single 2 port connected piece like you show in the 165066392039 listing you mention.

Posted on: 2021/9/15 12:38
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Re: 1941 Packard 356 8 cylinder - Low Vacuum After Rebuild
#2
Quite a regular
Quite a regular

hynesjm
Update: The Manifold IS leaking.

I made an adapter with a tire stem, piece of a tin can and a silicone coupler with hose clamps so I could slightly pressurize the intake manifold. I then put about 5 PSI of air to it and sprayed the intake ports with soapy water and could see at least 3 of the 4 inlet connections blowing bubbles.

I will R&R the manifolds and report back to see if that improves the situation...a good case of K.I.S.S right here :)

Posted on: 2021/9/12 23:41
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1941 Packard 356 8 cylinder - Low Vacuum After Rebuild
#3
Quite a regular
Quite a regular

hynesjm
Hi All,

I have a 1941 180 with a recently rebuilt 356 straight 8 cylinder that has hydraulic lifters (I believe, see attached picture) that I have never been able to get to idle smoothly or have acceptable vacuum. No matter what I have done with Carburetor or timing, I struggle to get 13 inches of vacuum at idle of ~570-600 RPM.

I have been trying to find a major intake manifold leak that would explain this, but
can't seem to find an obvious leak. I am now wondering if a valve train with a misaligned cam or without sufficient clearance (~.03 to .07") is to blame?

From the build sheet, the following camshaft information was listed (note that engine builder was not Packard specific, but was a very sharp guy):

Cam Lobe Separation: 110.38
Centerline set to: 107.25

I have done compression and leak down checks, and while they look a little low (101 psi avg with 97 on the lowest , 7% leak down avg on each cylinder, highest at 9%), I don't think that would explain the very low vacuum readings?

cyl-Comp-Leak Down
1-102-6.3%
2-98-9.2%
3-100-7.9%
4-97-8.0%
5-101-6.6%
6-104-6.5%
7-103-5.3%
8-105-8.0%
Average:101-7.2%

Is there a way to check valve lash on an assembled engine? Everything I have read is checking and grinding valves to achieve the desired .03" to .07" clearance, but I haven't seen much on checking an already assembled engine.

Attach file:



jpg  IMG_8889.JPG (2,658.04 KB)
160461_613e9cec0e5e7.jpg 3264X2448 px

Posted on: 2021/9/12 19:49
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1941 180 Fuel Line & Fitting Size
#4
Quite a regular
Quite a regular

hynesjm
Hi Guys,

Can anyone confirm the stock steel fuel line size? I am pretty sure it is 5/16" (measured O.D. of the line to be around 0.325") with flare type fittings. I am thinking 5/16" brake line *should* be the same? This would mean the fittings would be 1/2"-20, correct?

Posted on: 2018/1/28 21:09
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Re: 1941 180 Clutch Linkage Picture/Diagram
#5
Quite a regular
Quite a regular

hynesjm
Joe,

Thanks for The pictures - It looks like I am missing a spring as both areas I highlighted in my initial pic look like they have springs on them in your car.

I hate to be a bother but can you confirm where they hook up on the other side - Do they just hook into a hole in the frame, or is there a bracket I am missing?

Posted on: 2018/1/9 19:26
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1941 180 Clutch Linkage Picture/Diagram
#6
Quite a regular
Quite a regular

hynesjm
Hi guys,

I am having a bit of trouble figuring out where the clutch return spring would go in the clutch linkage. I have attached a photo of the two areas I think it may hook up to on the linkage, but I am unsure where it would attach to on the car.

Thanks in advance!

Attach file:



png  (246.37 KB)
160461_5a54f28c90839.png 432X385 px

Posted on: 2018/1/9 11:49
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Re: Oil in Intake Manifold
#7
Quite a regular
Quite a regular

hynesjm
So I pulled a vacuum on the vacuum pump side of the fuel/vacuum pump and it did not hold a vacuum, but, it wasn't a huge leak.

20-15 in-hg ~ 5 sec
15-10 in-hg ~ 15 sec
10-5 in-hg ~45 seconds
5-0 in-hg ~ 2 minutes

I think i'm going to loop the vacuum pump for now and "collect more data". I did suck out some oily fuel from the bottom of the manifold, but it seemed to be more gas than oil.

I guess I should also make sure the gas side of the pump isn't leaking oil into the fuel.

Posted on: 2017/12/19 23:00
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Re: Oil in Intake Manifold
#8
Quite a regular
Quite a regular

hynesjm
Thanks for the Reply Ross.

I actually doubt I have *that* much idle time on the car. Probably more like 5 hours. Idle time is mostly just because I still have body panels off of the car and other projects going on, so yet to really get it on the road.

I think you might be on to something with the vacuum pump. It looked to be a fresh rebuild, but has been in a hot and dry environment for ~ 4 years, and on a shelf for who knows how long before that. I quickly took the tube from the fuel/vacuum pump to intake off and noticed some oil on the on the fuel/vacuum end of the tube. Nothing excessive, but I am assuming there should be *no* oil.

I would guess a diagnostic test would be to pull a vacuum from the inlet and plug the outlet and make sure it holds (I am sure that there is a diagnostic test in some packard literature one of the gurus could post)?

Posted on: 2017/12/13 23:17
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Oil in Intake Manifold
#9
Quite a regular
Quite a regular

hynesjm
Hi All,

1941 super 8 with a fresh rebuild. Compression test seems to be good.


cyl-(PSI)
1---100
2---95
3---98
4---92
5---95
6---95
7---100
8---100


I just changed all the spark plugs because they were all coated in oil and the car was misfiring. The car only has about 10 hours of run time, ~90% at idle.

I do remember seeing some oil in the intake after a hot shutdown/restart with some oil smoke out the tailpipe, but in general the engine seems to run good with no obvious signs/smells of blow-by.

I do have a PCV hooked up from where the draft tube used to connect, but there doesn't seem to be any obvious signs of excessive oil re-circulation via the PCV vent, and the event mentioned above was before the PCV was hooked up (I think). It could be possible this is in fact the cause, but I keep thinking of the amount of oil I remember seeing in the intake.

Just wondering if there are any known causes unique to a super 8 that could cause oil getting into the intake manifold (i.e. a part left out during the rebuild, etc.) and cause plug fouling.

Posted on: 2017/12/13 19:46
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Re: Clutch Clevis Pin
#10
Quite a regular
Quite a regular

hynesjm
see attached pic. Simple enough when you see it together...

Attach file:



jpeg  (414.88 KB)
160461_59b60e725691c.jpeg 2048X1536 px

Posted on: 2017/9/10 23:17
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