428 engine squeak
Thread Starter
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Cross-Country
Joined: Oct 2004
Posts: 99
Likes: 8
428 engine squeak
Hello fellow FE folks!
I have a problem that has me scratching my head. My engine squeaks!
From cold when I fire it up, no squeak. As it warms up, the noise becomes loud. Check out the attached recording.
Troubleshooting has included... Removing all belts to remove the alternator, water pump, and PS pump. Noise still present. Check for loose exhaust, headers, collectors, motor mounts, or anything rubbing on the engine. All look good. I probed around with a dowel to my ear and it sounds internal but hard to isolate. Oil has good pressure. Confirmed I have flow to the top end.
When cold and warming up, it has what I believe is a lifter tick. Goes away when warm.
Is it time to change my mice?
About my engine & truck
- 428ci
- Lunati retrofit roller
- Holley sniper with hyperspark coil, ecu, and distributor
- Around 5000 miles since build
Anyway, eager to hear your thoughts.
I have a problem that has me scratching my head. My engine squeaks!
From cold when I fire it up, no squeak. As it warms up, the noise becomes loud. Check out the attached recording.
Troubleshooting has included... Removing all belts to remove the alternator, water pump, and PS pump. Noise still present. Check for loose exhaust, headers, collectors, motor mounts, or anything rubbing on the engine. All look good. I probed around with a dowel to my ear and it sounds internal but hard to isolate. Oil has good pressure. Confirmed I have flow to the top end.
When cold and warming up, it has what I believe is a lifter tick. Goes away when warm.
Is it time to change my mice?
About my engine & truck
- 428ci
- Lunati retrofit roller
- Holley sniper with hyperspark coil, ecu, and distributor
- Around 5000 miles since build
Anyway, eager to hear your thoughts.
Cargo Master
Joined: Jan 2016
Posts: 2,672
Likes: 373
I tend to agree with checking the rocker arms first (because they're the easiest). Remove them and look for wear marks or fretting on the shaft. And I'll add to also look for push rods rubbing the intake by looking at it as assembled and then inspecting the push rods after removing them. Push rods themselves probably aren't making the squeak but if rubbing too much they can cause binding and damage to the rocker arm assembly that you can hear once the oil is warmed up.
Thread Starter
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Cross-Country
Joined: Oct 2004
Posts: 99
Likes: 8
Small update. I have not pulled the engine apart. But, I took the recording and through some analysis was able to determine the squeak is occurring approximately 400 times a minute or roughly cam speed. That gives me some hope it is valvetrain. Fingers crossed my cam didn't get chowdered.
I'll post when I make more discoveries.
I'll post when I make more discoveries.
Cargo Master
Joined: Oct 2020
Posts: 2,676
Likes: 785
If the roller did lock up and is skidding on the cam that type of damage is usually easy to fix by just regrinding that one lobe. It can look bad yet clean up in only a few thousandths.
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Cross-Country
Joined: Oct 2004
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Got an update for y'all!
#5 Exhaust lifter is toast. Very clear surface damage to the roller surface. The needle bearings are far from smooth.
Threw a quick eye on the others lifters and they do not appear damaged. But, I'll be cleaning and closely inspecting all.
Now for the cam, Looking down the lifter bore for #5 E, there is no obvious damage. Here too I'll be inspecting all lobes while slowly turning. I'm also going to put my dial indicator on the failed one and compare to a good one and spec.
#5 Exhaust lifter is toast. Very clear surface damage to the roller surface. The needle bearings are far from smooth.
Threw a quick eye on the others lifters and they do not appear damaged. But, I'll be cleaning and closely inspecting all.
Now for the cam, Looking down the lifter bore for #5 E, there is no obvious damage. Here too I'll be inspecting all lobes while slowly turning. I'm also going to put my dial indicator on the failed one and compare to a good one and spec.
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Cargo Master
Joined: Oct 2020
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If you see surface damage to the roller the surface of the camshaft lobe is almost certainly damaged. You probably should go ahead and pull the cam so that you can really get a good look at that lobe all the way around.
Cargo Master
Joined: Oct 2020
Posts: 2,676
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If you pull the cam and the lobe really does have no damage you're good to go. If it is torn up a bit it will be very easy for the cam grinder to just set up on it and regrind that one lobe using the same master. Good as new.
Thread Starter
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Cross-Country
Joined: Oct 2004
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Got her tore down and cam is out. I was in error. It is the #5 intake. Roller on the lifter is toast. Lobe on the cam shows clear signs of the roller skipping over the surface.
Local machine shop says though they could clean up the lobe, they do not recommend it as it will remove the surface hardening and will fail sooner. Their recommendation is to replace the cam.
I ordered this... Howards Cams CL250705-10 - Howards Cams Retro-Fit Hydraulic Roller Camshaft and Lifter Kits. Should be delivered today.
Local machine shop says though they could clean up the lobe, they do not recommend it as it will remove the surface hardening and will fail sooner. Their recommendation is to replace the cam.
I ordered this... Howards Cams CL250705-10 - Howards Cams Retro-Fit Hydraulic Roller Camshaft and Lifter Kits. Should be delivered today.
Cargo Master
Joined: Oct 2020
Posts: 2,676
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Don't scrap that cam. That lobe can be fixed easily with absolutely no loss of durability. Cams are hardened before they are ground and an induction hardened core like that one is hardened almost to the barrel.