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Topic: 1940 Packard 1801 won't start

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bob hattler

Re: 1940 Packard 1801 won't start

#41

Quite a regular

Compression test with new gauge and highly experienced mechanic.
Bob

Posted on: 2017/1/12 12:10

Joe Santana

Re: 1940 Packard 1801 won't start

#42

Home away from home

This may help him:
packardinfo.com/xoops/html/downloads/1940_IllustatedRepairManual.pdf

Posted on: 2017/1/12 12:21

fredkanter

Re: 1940 Packard 1801 won't start

#43

Home away from home

A timing chain that has jumped a tooth will not cause most cylinders to have zero to extremely low compression !!!!!!!!
The engine will still run, however with low power.

In 56 years I've never seen a Packard with a chain so loose that it jumped timing, besides the engine was rebuilt 3 years ago!!!!!!!!!!

Posted on: 2017/1/12 12:27

Owen_Dyneto

Re: 1940 Packard 1801 won't start

#44

Forum Ambassador

OK, sounds like compression values are correct.

In case you don't have it, here is the valve timing from Motor's Manual, 12th Edition: 1940-47 "110" and "120" -- With No. 1 intake valve set to 0.013" clearance (.0125 on 1940) the valve should start to open one degree before TDC.

Posted on: 2017/1/12 12:30

JT120

Re: 1940 Packard 1801 won't start

#45

Home away from home

"Compression test with new gauge and highly experienced mechanic.
Bob"

Does that mean the compression was good on all cylinders??

Posted on: 2017/1/12 19:08

41 special 1485

Re: 1940 Packard 1801 won't start

#46

Not too shy to talk

Is it possible that the overheated engine caused the head gasket to fail?
Perhaps the cylinders became water logged and created a situation where the engine was cranked while it was hydro-locked. Thus bending valves?
More clues please...

Posted on: 2017/1/12 20:56

Stop wasting time......get back to work!

JWL

Re: 1940 Packard 1801 won't start

#47

Home away from home

Quote:

fredkanter wrote:
A timing chain that has jumped a tooth will not cause most cylinders to have zero to extremely low compression !!!!!!!!
The engine will still run, however with low power.

In 56 years I've never seen a Packard with a chain so loose that it jumped timing, besides the engine was rebuilt 3 years ago!!!!!!!!!!

Fred, I have seen engines with jumped timing chains that could not be restarted.

A 3-year old rebuild would seem to negate a loose chain, but who knows what was installed and how it was installed.

And, please stop screaming every time you try to make a point!!!!!!!!!!!

(o[]o)

Posted on: 2017/1/12 23:14

We move toward
And make happen
What occupies our mind... (W. Scherer)

flackmaster

Re: 1940 Packard 1801 won't start

#48

Forum Ambassador

I agree wtih Fred that we are still lacking detailed diagnostics to suggest remedies. I think Fred is just .....ummm... Passionate with his willingness to help. And we've been through prior long term problems with Bob Hattler's car...remember it always stalled coming to a stop under a full moon?
OH, and no doubt its a Kanter reproduction timing chain (to blame....KIDDING)

DAF

Posted on: 2017/1/13 0:02

bob hattler

Re: 1940 Packard 1801 won't start

#49

Quite a regular

how is it possible to have compression on one cyl?
Blown head gasket?
A slipped timing chain would actually cause near the same compression on every cyl, as the exhaust valve would open at the specified interval for each cyl.
I believe Fred is correct, it's not the chain !!!!!!!!!!!!!!!

Bob

Posted on: 2017/1/13 7:23

Owen_Dyneto

Re: 1940 Packard 1801 won't start

#50

Forum Ambassador

I believe Fred is correct, it's not the chain !!!!!!!!!!!!!!!

A number of us have been suggesting that right along for a while now, so why the reluctance to just check the valve timing to confirm? That was suggested as far back as post #3.

Posted on: 2017/1/13 11:03

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