Cold Start Rattle After Replacing 4.6 Timing Set
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Mountain Pass
Joined: Apr 2022
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Cold Start Rattle After Replacing 4.6 Timing Set
Memorial Day weekend, I replaced my timing chains, tensioners, guides, and oil pump on a 4.6 2V with Melling components. I did this because I was starting to hear the cold start rattle. I also replaced the oil and filter with full synthetic 5w-30 and a Motorcraft filter.
Unfortunately, I still have what I believe is the cold start rattle. The old guides didn't have any chunks missing, so I don't think I have huge pieces blocking the oil pickup, but I haven't pulled the pan. I didn't carefully clean the tensioner mounting points because none of the videos I watched specifically mentioned it, and the surface didn't seem to have any residue, since the tensioners are cast iron without a gasket.
Any thoughts on why I still have the rattle? Tests I should do?
Unfortunately, I still have what I believe is the cold start rattle. The old guides didn't have any chunks missing, so I don't think I have huge pieces blocking the oil pickup, but I haven't pulled the pan. I didn't carefully clean the tensioner mounting points because none of the videos I watched specifically mentioned it, and the surface didn't seem to have any residue, since the tensioners are cast iron without a gasket.
Any thoughts on why I still have the rattle? Tests I should do?
Cargo Master
Joined: Dec 2015
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My '07 2V 4.6 has the cold start rattle, too. I started running some Amazon Basics 0W-40 Euro because I have it and this truck is a beater. I swear the rattle is greatly reduced, which is not something I was expecting or aiming for -- I was just trying to use my oil stash.
Do you get the noise with no belt installed?
Do you get the noise with no belt installed?
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Mountain Pass
Joined: Apr 2022
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Likes: 11
My '07 2V 4.6 has the cold start rattle, too. I started running some Amazon Basics 0W-40 Euro because I have it and this truck is a beater. I swear the rattle is greatly reduced, which is not something I was expecting or aiming for -- I was just trying to use my oil stash.
Do you get the noise with no belt installed?
Do you get the noise with no belt installed?
I haven't checked for rattle without the belt - what would that tell me.
Cargo Master
Joined: Dec 2015
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No belt would just rule out accessories. You shouldn't have rattling if all your timing set is new, unless you're getting roller follower noise.
You did pull the grenade pins, yes?
I don't think a HV pump would affect cold start rattle, no. A HV pump helps once the oil is hot and thinned, and it's most beneficial on 3V's, esp those with cam phasers.
You did pull the grenade pins, yes?
I don't think a HV pump would affect cold start rattle, no. A HV pump helps once the oil is hot and thinned, and it's most beneficial on 3V's, esp those with cam phasers.
Thread Starter
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Mountain Pass
Joined: Apr 2022
Posts: 100
Likes: 11
Ok, I may try a no belt test. It's not that hard to take the belt on and off.
Yes, I did pull the grenade pins! Also, if I hadn't I think it would rattle all the time too.
Thanks for the perspective on the oil pump.
Yes, I did pull the grenade pins! Also, if I hadn't I think it would rattle all the time too.
Thanks for the perspective on the oil pump.
Hotshot
Joined: Jul 2020
Posts: 10,456
Likes: 2,630
From: Near Salt Lake City
No, not much difference between the HV and the regular oil pump
People with high miler engines just have better luck with the HV
You just pull the oil pressure sending unit out and install a direct pressure gauge in the port
Run it and check the oil pressure then replace the sender
People with high miler engines just have better luck with the HV
You just pull the oil pressure sending unit out and install a direct pressure gauge in the port
Run it and check the oil pressure then replace the sender
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Mountain Pass
Joined: Apr 2022
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Ok, I picked up an oil pressure tester from Harbor Freight and did a cold start with it attached. I heard the rattle. My initial pressure was 85 psi, and it went down to about 40 psi with the engine idling at 188 *F.
Do those numbers look normal?
Do those numbers look normal?
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Cargo Master
Joined: Dec 2015
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Seems good to me. I don't think oil pressure is your issue
Cargo Master
Joined: Dec 2015
Posts: 2,913
Likes: 509
For giggles try a heavier oil and see if it changes.
You might and/or swap a filter to verify ADBV operation
Cold start rattle is most likely tensioners pumping up. Even the ratcheting ones have some float and must pump up.
You might and/or swap a filter to verify ADBV operation
Cold start rattle is most likely tensioners pumping up. Even the ratcheting ones have some float and must pump up.
Thread Starter
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Mountain Pass
Joined: Apr 2022
Posts: 100
Likes: 11
How thick are you thinking? I may try that.
Is some degree of cold start rattle? Also, is it possible that I have a dirty surface between the tensioner and the block that causes some overnight leak?
I don't think I mentioned this in the first post, but I do have some sort of tick in my engine. I'm not sure if it's a lifter, a rod, or a cat, but it comes from the passenger side and comes and goes at all temps. I didn't think it is related, but that is additional info.
Is some degree of cold start rattle? Also, is it possible that I have a dirty surface between the tensioner and the block that causes some overnight leak?
I don't think I mentioned this in the first post, but I do have some sort of tick in my engine. I'm not sure if it's a lifter, a rod, or a cat, but it comes from the passenger side and comes and goes at all temps. I didn't think it is related, but that is additional info.
Thread Starter
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Mountain Pass
Joined: Apr 2022
Posts: 100
Likes: 11
Alright, it's been a while, but I finally put a video together with a bunch of clips from different days' starts.
What's a bit weird is that it doesn't do the rattle on every start, just some of them.
What's a bit weird is that it doesn't do the rattle on every start, just some of them.
1st Gear
Joined: Feb 2025
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Did you ever find the fix?!
Alright, it's been a while, but I finally put a video together with a bunch of clips from different days' starts.
https://www.youtube.com/watch?v=eNFCnYsSm9E
What's a bit weird is that it doesn't do the rattle on every start, just some of them.
https://www.youtube.com/watch?v=eNFCnYsSm9E
What's a bit weird is that it doesn't do the rattle on every start, just some of them.
thank you for any info!