Not sure what oil was beingused by PO but I changed to M1 10W40 high mileage as soon as I got the truck.
The noise was there before the oil change.
I ONLY hear this noise from inside the car when I am idling. When I leave the engine running and open the hood to take a loksee I never hear the noise from the bay. I know I need to crawl under there but I have no friends nearby that can assist. I can see the headlines now: "Dunce Discovery Owner Ran Over By His Idling Truck"
When I goose the go pedal lightly (premium gas you know ) I feel that it goes up with rpm and then dissipates.
What can it be? Any thoughts, rumors, conjectures, suggestions?
If any one says slipped liner or as such I will pass right out
PS: By the way it such a slight sound but I am anal like that about my vehicles. A vehicle should be a finely engineered machine that runs like a swiss watch.
Well, could be a few things, exhaust leaks at the y-pipes emit more of a tick,tick than a clack,clack. But I'd still give it a try.
I know that there are un- flat tappet friendly engine oils out there, and most Mobil 1 grades are part of them. I know by experience that diesel engine oil like Rotella's 15W40 for summer and synthetic Rotella 5W40 is very friendly for our flat tappet engines and quiets them down quite a bit.
__________________ Knowledge is only really worth anything when its been experienced first hand. If you heard it from a guy who heard it from a guy.....nevermind and keep it to yourself.
[SIGPIC]
Exhaust leaks are easy to find. Just get a bit of garden hose a few feet long and put one end in your ear and the other end near any joins in the exhaust system. You will hear any leak quite clearly.
A slipped liner will not tend to make a noise when it is cold. It also tends not to move proportionally with revs. That is, as you rev the motor the sound gets less and does not increase in proportion to the revs.
A noisy lifter or worn cam will tend to be loudest when cold and possibly disappear when warm. It will also change in frequency in direct relationship to any change in revs.
I also get a sound but I'm not sure what mine can be its more of a little jingly sound.......kinda like those balls that have a little jingle bell inside......what the heck is it?
More noticeable when the car is starting and the sound is in direct relation to the revs of the vehicle but dies down as I continue to drive the car and absolutely noticeable in the mornings from a cold start.......what could it be? (not trying to hijack this post but maybe its the same sound)
I also get a sound but I'm not sure what mine can be its more of a little jingly sound.......kinda like those balls that have a little jingle bell inside......what the heck is it?
More noticeable when the car is starting and the sound is in direct relation to the revs of the vehicle but dies down as I continue to drive the car and absolutely noticeable in the mornings from a cold start.......what could it be? (not trying to hijack this post but maybe its the same sound)
can you be more specific/detailed please, I dont have all the short term terminology down yet.
The cam turns within the motor and has raised points on it. The lifter rides on the cam and as it rises with the high points on the cam, it opens the valves. To cater for wear and tolerances within the valve system, the lifters self adjust. The cam or the base of the lifters wear to a stage that they can not adjust enough to take up the slack. At this point a gap can open up which causes a ticking or clacking noise as they hit each other. The adjustment in the lifter occurs with the aide of oil pressure through a small hole. The lifters tend to also bleed down a little when not used for a while. This bleed down and the thicker cold oil attempting to get through the small hole in the lifter tends to make any noise worse when the engine is cold. As the oil thins and has had time to get in little by little into the lifter, they tend to quieten down.
A liner is made of steel and the block is made of aluminum. The aluminum will expand and contract greater than the steel. So when the motor is cold the block has a tighter fit around the liner and it will tend not to move as easily. Rather than a direct mechanical hit like the lifters, a lose liner moves simply from the friction of the piston on the liner. Counteracting this is the friction between the liner and the block. As the piston moves faster it is harder for the liner to keep up and the noise tends to quieten down.
So if it is noisy when it is cold, has a direct relationship with revs (even into the higher revs), and tends to quieten down as the motor warms up, the issue is most likely cam or lifters. If it is quiet when cold, but becomes noisy as the motor warms up and tends to disappear at higher revs, it is most likely a liner.
Coolant loss will not occur with most slipped liners. It will only occur where the block also happens to be cracked behind the liner. This is only one cause of slipped liners. My last motor had 3 slipped liners at the one time and had no coolant loss or lack of power. If I could have put up with the noise, it would have continued to run for some time. My mechanic has run land rover cars with slipped liners for many years and often sold them several years later with them like that.
If you are a little mechanical, I would suggest you pull the engine down thru the valley pan, pull 1 lifter at a time looking for wear on the cam lobe, lifter surface or push rods which do wear themselves shorter with time. Then check the rocker shaft, remove and inspect each are for wear.
If it is internal, this will find it.
__________________
Mike
Retired service manager, member of Solihull Society, SCLR, NCLR and the Santa Barbara 4Wheelers clubs.
99 D2, 3" lift, CDL with Detroit,T.T. lockers, 4:11's,H.D. axles, custom ft/rear bumpers with sliders, a 9500 HSI Warn winch and 5 HID's.
I also get a sound but I'm not sure what mine can be its more of a little jingly sound.......kinda like those balls that have a little jingle bell inside......what the heck is it?
More noticeable when the car is starting and the sound is in direct relation to the revs of the vehicle but dies down as I continue to drive the car and absolutely noticeable in the mornings from a cold start.......what could it be? (not trying to hijack this post but maybe its the same sound)
No hijack and I am glad you chimed in actually. I think we may have the same sound. It does sound like jiggling for sure. But mine is there when warm.
The AutoGuide.com network consists of the largest network of enthusiast-owned enthusiast-operated automotive communities.
AutoGuide.com provides the latest car reviews, auto show coverage, new car prices, and automotive news. The AutoGuide network operates more than 100 automotive forums where our users consult peers for shopping information and advice, and share opinions as a community.
Clack.Clack.Clack Sound
) I feel that it goes up with rpm and then dissipates.
Knowledge is only really worth anything when its been experienced first hand. If you heard it from a guy who heard it from a guy.....nevermind and keep it to yourself.
Linear Mode
