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Knock on warm up??

  #1  
Old 02-18-2018, 07:33 PM
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Knock on warm up??

My 300 has a new warm up knock that has progressively gotten worse over the past few weeks. it knocks only when the engine is cold. Is this by any chance a stuck lifter, oil circulation issue, rockers loose? it sounds as if the sound is coming from the cam/lifter area or around the pushrod cover. It only knocks in drive with my foot on the gas and creating a little torque on the engine. It has 150,000 miles on it and has been running 5w-40 oil from the day it was purchased. after the engine has slightly warmed up the knock is gone completely.

Any advice is helpful. Thanks
 
  #2  
Old 02-18-2018, 08:58 PM
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I hope you do not have piston(s) with broken / cracked skirts
 
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Old 02-19-2018, 09:17 AM
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Since "only knocks in drive...", could it be something loose [bolts] in the flex plate / torque convertor area?
 
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Old 02-20-2018, 05:58 AM
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I can specifically hear it coming from the pushrod cover area, is oil circulation a common issue for 300's
 
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Old 09-06-2018, 07:56 PM
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so i know this is a year old thread of mine but the sound is back and a little worse. let me restate the problem, i start the truck just fine no problems running fine, no sounds or anything. i drive up to the road and start accelerating with the engine cold, not fast just normal acceleration maybe up to 35 mph, as i let off the gas i get a TAT! TAT! TAT! TAT!TAT! TAT! TAT! and i let off the gas completely and it goes away. so i come to a stop with one foot on brake one on gas and once rpms are at 1500ish TAT! TAT! TAT! TAT! TAT! i had my father work the brake and gas while i put the ole stethoscope to the engine and it souds as if its coming from the back of the heads/push-rod cover. hard to tell. once the engine is completely warm there is no tapping at any time. should i take tis to a mechanic to get the heads pulled and adjusted/replaced/looked at? or should i try a few things before i resort to a mechanic. i can do alot myself but heads and adjusting valves arent something i know alot about. any advise is welcome im at a loss, i have added a lucas oil additive to the oil. and this engine has been running 15w-40 oil all its life. 15w_40 is a diesel oil by the way.
 
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Old 09-07-2018, 08:02 AM
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Check the bellhousing area.
It may be loose / improperly installed flex plate / flywheel.
It may be the starter spacer plate is rubbing against the flex plate.
It may be the cat heat shield has broken welds.
 
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Old 09-07-2018, 08:30 AM
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well i dont have a cat it was taken off in the 90s, flex plate is still tight and has never been replaced, the sound is radiating from the heads or the pushrod cover area, my idea is that some of the valvetrain is work out after running on such a thick oil for 150,000 miles. i can try to get a video next week but i have a flowmaster so it will be hard to pick up the sound. the sound is something in between a knock and a tap, so i cant say its lifters but i will have to check the starter, its tight but could be an issue.
 
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Old 09-07-2018, 05:48 PM
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i had a cold lifter tap in 65 240ci i did oil change and added lucas oil treatment - no more cold engine tap been over 6 months
good luck
 
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Old 09-12-2018, 11:50 AM
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i will be due for an oil change soon, the oil is dark right now, ill see what an oil change does
 
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Old 09-12-2018, 07:09 PM
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Originally Posted by 78Fords View Post
i will be due for an oil change soon, the oil is dark right now, ill see what an oil change does
when you do change the oil put some lucas oil treatment in - walmart has it for about $9 - let us know how you make out
good luck
 
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Old 09-27-2018, 11:28 AM
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alright so an oil change did nothing, and the noise continued to get louder so i took my truck to a friend and me and him will tear into it friday. Right now sounds like a roofing crew pushing my truck
 
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Old 10-01-2018, 11:21 AM
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okay so when i hit the gas with my foot on the break the engine rises out of the compartment, my engine mounts are shot. my guess is that the ticking is an external rattle caused by the engine movement. im puting in a drivers side mount today ill let you know how it goes. its an expensive fix if it fixes the problem, 1986f150six may have been correct
 
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Old 10-01-2018, 06:13 PM
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A buddy that had a 69 Falcon with a 200-6 cylinder busted a motor mount. When he stepped on the gas, the engine jumped up, fan hit and cut the top radiator hose, bent the blades forward, and the spinning blades gutted his new radiator. Thank goodness that all you got was an annoying rattle!
 
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Old 10-02-2018, 10:31 AM
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Originally Posted by CharlieXLT View Post
A buddy that had a 69 Falcon with a 200-6 cylinder busted a motor mount. When he stepped on the gas, the engine jumped up, fan hit and cut the top radiator hose, bent the blades forward, and the spinning blades gutted his new radiator. Thank goodness that all you got was an annoying rattle!
for sure, i dont know for sure that this will fix it but i am willing to try. They needed to be replaced anyway because they are bad
 
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Old 10-08-2018, 10:53 AM
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Okay new problem, where can i find the rubber part of motor mounts for 78 F100 300 C6. The ones from oriellys make the motor lopsided enough to bind the linkage so it wont go out of park. LMC doesnt have the rubber part that i can see, i dont know where else, any ideas?
 

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