Engine rattle on fresh start up

[RustyRatRod]

The cam and lifters were new when I installed them in 2007.



That describes it exactly, just a momentary clatter that clears up immediately after starting. It never rattles any other time.



I don't think that I mentioned being "worried", just curious to learn if others have had a similar situation.
I have 3 other hydraulic cam Mopar V8s in cars out back that start up and are as silent as new. Even the 383 in Jigsaw, an engine I rebuilt using a Mopar Performance 280/474 cam. That dude just starts and rumbles.
I'm heading out back to tinker. I'll report my findings....

If that's the case, it probably has light preload on a few and they sound off a tad till they get full pressure. Probably a non issue.

 

[Kern Dog]

Thanks everyone. I wasn’t worried, just curious. My 2007 truck will rattle upon start up if I’m low on oil. With 414,000 miles, it goes through a bit.

 

[missing linc]

Good to know you got it sorted out.
Merry Christmas!

 

[RustyRatRod]

Thanks everyone. I wasn’t worried, just curious. My 2007 truck will rattle upon start up if I’m low on oil. With 414,000 miles, it goes through a bit.

So, one could say you're an old fart driving an old fart.

 

[Kern Dog]

I don't feel old but the graying hair tells the truth.

 

[Kendog 170]

I agree about which oil. Back in the 80's if you used Citco oil your engine it would make lifter noise. My dad was a mechanic back then and found people often having this issue.

 

[Oldmanmopar]

Cam Bearings, or rod bearings

 

[TF360]

No issues- just old broken down oil!

 

[moparmark65]

Rattle…..GONE.
Fresh oil and filter and on today’s cold start, silent and smooth.
This filter looks similar to the new NAPA filters so I doubt it really is 10-15 years old.

View attachment 1716491719

I have some new/old Castrol that has never been opened despite being quite old.

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This oil is SF rated….

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This is from back when zinc was still in decent numbers.

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Fresh oil and filter made the difference here. Score!
While under there, I spotted a couple core plugs ready to spew.
Plenty to do here!

That was my “ go to “ oil back in the day. Lovednit!