Cracked flexplate?
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Junior User
Joined: Jan 2007
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Cracked flexplate?
So I've recently developed a ticking noise in my truck that has grown susbstantially worse over the last 700mi or so. It sounds like a lifter but the truck runs like a champ and doesn't have any codes, etc. I tried a hunch today and decided to check the torque converter bolts because I had a problem with my Jeep once where a bolt came loose on the converter and it made a noice that sounded similar. Anyhow, I crawled under the truck today and pulled the bottom and lower front inspection plugs out of the bellhousing and had a look. With the truck running you can see that there is a bit of a wobble to both the converter and the ring gear on the flexplate. I checked all the bolts on the converter and they all seemed pretty good with the exception of two that moved slightly. The next thing is, if it's running and you cover both bell housing plug holes with your hands while you're under it, the noise virtually disappears but can still be heard if you're standing beside the truck. Maybe the noise is still projecting forward through the engine? Thoughts?
Fleet Owner
Joined: Apr 2012
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From: Spanaway
Just because the truck is running good don't rule out
the engine. The lifters can and do die. Just ask Anthony.
The lifters would tend to be a squeak. BUT........
Get the stethoscope out and do some snooping.
Sean
the engine. The lifters can and do die. Just ask Anthony.
The lifters would tend to be a squeak. BUT........
Get the stethoscope out and do some snooping.
Sean
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Junior User
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Well, the noise seems to be getting a bit louder. 
I can't get it into my guys shop until next week so the waiting is killing me.
Anyhow, I shot some short vids that will hopefully give you all a better idea of the sounds.
Video 1 is when it's cold at first start. No tick but pukes raw diesel (about 30* this morning)
Video 2 is after it's been warmed up to about 160*.
Video 3 gives shows the tick and a sound of playing card in spokes.
Any new suggestions?
I can't get it into my guys shop until next week so the waiting is killing me.Anyhow, I shot some short vids that will hopefully give you all a better idea of the sounds.
Video 1 is when it's cold at first start. No tick but pukes raw diesel (about 30* this morning)
Any new suggestions?
Logistics Pro
Joined: Dec 2004
Posts: 4,138
Likes: 7
From: South Weber, Utah
The time it sounded more pronounced was as the engine was slowing down after it was revved, it sounded like valve train noise to me. Perhaps video capture near the bottom of the bellhousing would give a better idea of what the noise sounds like that you are hearing.
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I'll try and get one from underneath. When I did the #8 injector for the third time a few weekends ago I checked the top end and everything seemed to move fine when I turned the engine over with the valve cover off.
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Logistics Pro
Joined: Dec 2004
Posts: 4,138
Likes: 7
From: South Weber, Utah
If it were the flex plate being cracked it would do it regardless of temp. What oil weight are you running? Are you running the OEM oil cap and OEM filter? Also do you show oil pressure on the factory gauge at all times.
You say that you have replaced the #8 injector 3 times, were they OEM reman injectors and have you had the dynamic fuel pressure tested? It needs to remain above 45 PSI at all times and most importantly at wide open throttle ( WOT )
You say that you have replaced the #8 injector 3 times, were they OEM reman injectors and have you had the dynamic fuel pressure tested? It needs to remain above 45 PSI at all times and most importantly at wide open throttle ( WOT )
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Junior User
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If it were the flex plate being cracked it would do it regardless of temp. What oil weight are you running? Are you running the OEM oil cap and OEM filter? Also do you show oil pressure on the factory gauge at all times.
You say that you have replaced the #8 injector 3 times, were they OEM reman injectors and have you had the dynamic fuel pressure tested? It needs to remain above 45 PSI at all times and most importantly at wide open throttle ( WOT )
You say that you have replaced the #8 injector 3 times, were they OEM reman injectors and have you had the dynamic fuel pressure tested? It needs to remain above 45 PSI at all times and most importantly at wide open throttle ( WOT )
Injectors were Alliant rebuilts. I haven't checked the fuel pressure recently but when I did check it last it was 65 at idle with the blue spring. I'll toss a gauge on it tomorrow and see where she currently sits.
Last time my guy scanned the truck it showed cylinder #8 compression down 20% when cold and about 8% when warmed up.
Fleet Owner
Joined: Apr 2012
Posts: 27,307
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From: Spanaway
I am thinking lifters.
Pull off a valve cover and use a dial indicator
and compare lift of the intakes to the other intakes and so on.
Take a good look at the back lifters. Also look for metal in the
oil that you drain out and when you clean the magnet.
Sean
Pull off a valve cover and use a dial indicator
and compare lift of the intakes to the other intakes and so on.
Take a good look at the back lifters. Also look for metal in the
oil that you drain out and when you clean the magnet.
Sean
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I am sure hoping that isn't the case but it's always a possibility.
Maybe rather than start by pulling the tranny I'll have my guy pull the valve cover again and actually check those valves with a gauge. I'm also going to see if he has a barescope to check on that #8 cylinder. I take it in on Tuesday afternoon so we'll see what he finds.