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Old 08-22-2014, 05:37 AM   #21
George49Ford
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Default Re: Tell me this noise isn't what I'm afraid it is.

Might be apples and oranges here, but 30 some odd years ago I had a similar sound in '66 Chevy straight six. Turned out it was chipped tooth on timing gear. Might be easier fix than a rod.
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Old 08-22-2014, 08:36 AM   #22
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Default Re: Tell me this noise isn't what I'm afraid it is.

It does sound bad.

I wouldn't run it too much.

I might just run it shortly without any belts connected just to rule anything external out, but it does sound deep in the motor to me.

Time to pull the motor down again by the sound of it. (Sorry to say).

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Old 08-22-2014, 09:10 AM   #23
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Default Re: Tell me this noise isn't what I'm afraid it is.

This is a real long shot but maybe a loose crankshaft pulley? A few years back, mine was making a very similar noise and it was the crankshaft pulley.
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Old 08-22-2014, 09:25 AM   #24
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Default Re: Tell me this noise isn't what I'm afraid it is.

When the engine is cold does it knock immediately after starting or after it runs for a bit?
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Old 08-22-2014, 09:27 AM   #25
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Default Re: Tell me this noise isn't what I'm afraid it is.

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Originally Posted by Steves46 View Post
This is a real long shot but maybe a loose crankshaft pulley? A few years back, mine was making a very similar noise and it was the crankshaft pulley.
Remember the original post. How could a crankshaft pulley cause "just barely able to run"? I think that girl at Jiffy Lube may have over-tightened the Johnson rod. DD
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Old 08-22-2014, 09:30 AM   #26
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Default Re: Tell me this noise isn't what I'm afraid it is.

Yup, my eyes missed that part. Better start eating more carrots! Steve
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Old 08-22-2014, 10:04 AM   #27
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Default Re: Tell me this noise isn't what I'm afraid it is.

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Professor,
Pull one plug at a time and see if the knock stops or diminishes at any cylinder. If it is a rod this test would take all the pressure off the offending cylinder. Just a thought
John
this is what I would try first...anything mechanical can be repaired...
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Old 08-22-2014, 11:13 AM   #28
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Default Re: Tell me this noise isn't what I'm afraid it is.

I'll offer a WAG... based on events as they happened on my own 47...
burned piston(s). I had problems with pre-ignition/pinging, and eventually found three pistons with holes on top, at edge, down into the ring-lands.
With heads off, easy to see on top of pistons.
Oh, the fun
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Old 08-22-2014, 11:32 AM   #29
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Default Re: Tell me this noise isn't what I'm afraid it is.

Quote:
Originally Posted by sidevalve8ba View Post
When the engine is cold does it knock immediately after starting or after it runs for a bit?
The knocking is the same hot or cold

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Originally Posted by koates View Post
Henry, For a quick test you could just pull off one spark plug lead at a time and see which cylinder causes the knock to go quieter.
Quote:
Originally Posted by oldford2 View Post
Professor,
Pull one plug at a time and see if the knock stops or diminishes at any cylinder. If it is a rod this test would take all the pressure off the offending cylinder. Just a thought
John
Unfortunately, pulling the spark plug wires one at a time didn't identify the offending piston (if there is one). It would sure be nice to know which piston it is before I tear into it so I don't have to remove both heads and all pistons to find out. Any other test to find out?

Quote:
Originally Posted by Jack E/NJ View Post
Dunno? I'd pull all the plugs first and see if they can tell you anything. If they all look the same, then pull the heads and take a look at and massage the pistons for bearing or wristpin issues.

Jack E/NJ
How do I "massage the pistons for bearing and wristpin issues?"
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Last edited by Old Henry; 08-22-2014 at 11:43 AM.
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Old 08-22-2014, 11:40 AM   #30
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Default Re: Tell me this noise isn't what I'm afraid it is.

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I'll offer a WAG... based on events as they happened on my own 47...
burned piston(s). I had problems with pre-ignition/pinging, and eventually found three pistons with holes on top, at edge, down into the ring-lands.
With heads off, easy to see on top of pistons.
Oh, the fun
That is certainly a possibility since, just a couple of weeks before the noise started, I put my old Stromberg 97 carb back on in place of the Holley 94 I'd been running. Then after the noise started I checked the spark plugs. They were a bit lighter than tan, more toward white, so I checked the jets in the carb and found that they were the .44's I'd put in to climb Pike's Peak and probably too lean. That's when I put larger ones in hoping it would stop what I thought was just premature detonation but it didn't. Maybe the damage was already done.
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Old 08-22-2014, 11:47 AM   #31
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Default Re: Tell me this noise isn't what I'm afraid it is.

Well that sucks... Maybe talk to Walt about building you an engine over the winter for round 2?
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Old 08-22-2014, 12:31 PM   #32
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Default Re: Tell me this noise isn't what I'm afraid it is.

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Originally Posted by Old Henry View Post
That is certainly a possibility since, just a couple of weeks before the noise started, I put my old Stromberg 97 carb back on in place of the Holley 94 I'd been running. Then after the noise started I checked the spark plugs. They were a bit lighter than tan, more toward white, so I checked the jets in the carb and found that they were the .44's I'd put in to climb Pike's Peak and probably too lean. That's when I put larger ones in hoping it would stop what I thought was just premature detonation but it didn't. Maybe the damage was already done.
Why did you pull the 94?
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Old 08-22-2014, 12:39 PM   #33
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Default Re: Tell me this noise isn't what I'm afraid it is.

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Why did you pull the 94?
I had rebuilt it myself because it was seeping gas when I parked it in the garage at night and stinking up the garage. I also thought it might be part of the missing problem I had. After I rebuilt it, including replacing the power valve, it wouldn't hold gas after parked at night and I had to fill it with my electric pump every morning and choke it to start it. The engine didn't run any better either. So, I decided to put the Stromberg back in and see if it did any better.

I had Uncle Max rebuild my 97 but he left the .44 jets in thinking they were OK at my elevation of 5,000 feet. Maybe they were and that has nothing to do with anything but the plugs looked a little lean to me so I put bigger ones in. Didn't help the noise.
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Old 08-22-2014, 12:41 PM   #34
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Default Re: Tell me this noise isn't what I'm afraid it is.

I just tried removing a spark plug to see if that made any difference, planning on removing one at a time to try to identify the offending piston. Unfortunately, the noise from the air rushing in and out of the spark plug hole drowned out all other sounds and I couldn't hear anything else.

Other ideas to identify the bad piston?
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Old 08-22-2014, 12:55 PM   #35
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Default Re: Tell me this noise isn't what I'm afraid it is.

I would do a compression check.
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Old 08-22-2014, 04:20 PM   #36
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Default Re: Tell me this noise isn't what I'm afraid it is.

>>>I just tried removing a spark plug >>>

Do all the plugs looks the same now? Tan, white, black, wet, etc?

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Old 08-22-2014, 04:28 PM   #37
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Default Re: Tell me this noise isn't what I'm afraid it is.

Prof, try removing the lead, rather than the plug.

Mart.
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Old 08-22-2014, 05:08 PM   #38
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Default Re: Tell me this noise isn't what I'm afraid it is.

My thoughts since there is a noise and poor engine performance, it will require pulling a head off and see what's going on.

I can't see (in my mind) how changing jets, adding more choke, etc, would reduce a bearing/wristpin noise.
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Old 08-22-2014, 05:21 PM   #39
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Default Re: Tell me this noise isn't what I'm afraid it is.

Henry, there are six pistons that will come out the bottom of the engine with out pulling the head, I have done that when one of my pistons burnt a hole in itself, I cant remember which ones that can come out, been a lot of yrs, the hard part is collapsing the rings one at a time to get the piston back in the bore
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Old 08-23-2014, 02:17 PM   #40
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Default Re: Tell me this noise isn't what I'm afraid it is.

Quote:
Originally Posted by tamnalan View Post
I would do a compression check.
Just checked compression and got:

1-72
2-78
3-72
4-68
5-75
6-80
7-74
8-74

Does that tell you anything? It doesn't me.

Quote:
Originally Posted by Jack E/NJ View Post
>>>I just tried removing a spark plug >>>

Do all the plugs looks the same now? Tan, white, black, wet, etc?

Jack E/NJ
All plugs looked the same - dark - 'cause I just put the Stromberg back in with .47 jets.

Quote:
Originally Posted by Mart View Post
Prof, try removing the lead, rather than the plug.

Mart.
Did that. Didn't make any difference.

Any more ideas?
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