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Old 03-12-2018, 11:10 PM   #1
Chris Haynes
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Default Rod knockin'

I have developed a rod knock. Time to pull the pan and see whats happening. Hopefully the crank isn't damaged. That would open a big can of worms. I guess that answered my question whether my engine had poured or inserted bearings.
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Old 03-12-2018, 11:18 PM   #2
Chuck Sea/Tac
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Default Re: Rod knockin'

How does a rod knock determine insert or poured?
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Old 03-13-2018, 02:00 AM   #3
Tom Wesenberg
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Default Re: Rod knockin'

How was it determined whether it was a rod, piston slap, or wrist pin?
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Old 03-13-2018, 01:36 PM   #4
Chris Haynes
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Default Re: Rod knockin'

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How was it determined whether it was a rod, piston slap, or wrist pin?
Previous experience.
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Old 03-14-2018, 08:43 AM   #5
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Default Re: Rod knockin'

Ifn it just started knocking and isn't too loud yet the crank should still be good.
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Old 03-14-2018, 12:06 PM   #6
Chris Haynes
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Default Re: Rod knockin'

It may not be a rod bearing. My engine is still running smooth at idle and low speed.When I accelerate to mid range or higher it has a ferocious hard rattle
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Old 03-14-2018, 02:43 PM   #7
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Default Re: Rod knockin'

A rod knock is most noticeable on deceleration.
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Old 03-14-2018, 03:34 PM   #8
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Default Re: Rod knockin'

What do you know about the engine. Did you rebuild it or is it an unknown used engine. Could be a ton of things. I am thinking piston slap right now. How much compression do you have?? If you have decent compression it could be wrist pins.
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Old 03-14-2018, 09:47 PM   #9
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Default Re: Rod knockin'

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What do you know about the engine. Did you rebuild it or is it an unknown used engine. Could be a ton of things. I am thinking piston slap right now. How much compression do you have?? If you have decent compression it could be wrist pins.
When I bought the car I pulled the head and replaced it with a 5.5. I noticed 4 new pistons and 8 new valves with very little carbon. That is all I know about the engine. Idle and low RPM is fine anything above that results in loud clatter.
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Old 03-14-2018, 10:15 PM   #10
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Default Re: Rod knockin'

I'll take a stab, how about a broken valve spring (Using ESP). BTW how was it running noise-wise before the head swap? Maybe it is time to drop the pan for a look-see. Pulling the pan is always a good idea for any engine you or any new owner is not intimately familiar with.

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Old 03-15-2018, 01:32 AM   #11
Chris Haynes
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Default Re: Rod knockin'

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Originally Posted by J Franklin View Post
I'll take a stab, how about a broken valve spring (Using ESP). BTW how was it running noise-wise before the head swap? Maybe it is time to drop the pan for a look-see. Pulling the pan is always a good idea for any engine you or any new owner is not intimately familiar with.
I have run the 5.5 head for many months without problem.
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Old 03-15-2018, 01:58 AM   #12
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Default Re: Rod knockin'

Quote:
Originally Posted by Chris Haynes View Post
When I bought the car I pulled the head and replaced it with a 5.5. I noticed 4 new pistons and 8 new valves with very little carbon. That is all I know about the engine. Idle and low RPM is fine anything above that results in loud clatter.

Same symptoms my 29 had when I bought it. My center main was totally gone. All the babbit was in the bottom of the pan.
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Old 03-15-2018, 06:54 AM   #13
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Default Re: Rod knockin'

Sounds like a center main to me also. It does not sound like a rod.
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Old 03-15-2018, 11:45 PM   #14
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Default Re: Rod knockin'

I guess I'll find out when I pull it down. :-(
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