Duramax cracked flex plate knock

When a flexplate cracks, it often produces a loud knocking noise as it rotates. Mine cracked all over the place on me, didnt know it until i was doin some instals though and when i removed the starter i seen. Thought they saw a crack in flex plate, i have a warranty that covers the flex plate, i had to authorize the removal of trans for further inspection, but the shop said the spacer looks bad and they found no cracks. A flex plate with a crack like you describe can break at any time for any reason, and is a prescription for leaving you stranded, even if you are trying to be gentle with it. The truck had a new engine block installed at 17,000 miles. Than there is a chance that it could be a cracked flexplate that is causing the noise. If a thud is heard, the flywheel may be loose or damaged. I had posted a similar question when i first got my vehicle around sep. In the past few days my 94 has been knocking while in gear and at low rpms. I did check the converter bolts and they were good.

The background is made of mirror polished stainless steel which is 1mm thick and weighs 1 lb. Cracked flexplate how can i tell the chrysler minivan. Noise in my chevrolet silverado sounds like flywheel. Well my 2004 lly duramax has developed a loud knock. The engine will not run once the alarm has been activated until it is reset. Merchandise thanks for tuning in we hope you guys and gals enjoy the video, be sure to follow us on social. Rotational knocking when engine is warm duramax tuning, logging, and gauges.

Injector knock or cracked flexplate diagnosis w 2009 chevrolet duramax lmm dually. A loose bolt will hollow out the hole, and can cause a crack from the hole toward the middle real hard to see. It made a knocking sound similar to a cracked flexplate. Give a guess in the comments section and stay tuned. A couple of weeks ago i bought a 2002 chevy 2500hd crew cab diesel lb7 with 118,000 miles off of a private seller. Many models of the dodge durango are equipped with a factoryinstalled alarm system that monitors sensors mounted on the vehicle to detect unauthorized entry attempts. Oil pressure is good, 45 at idle up to 75 at 4500 rpm. Dec 19, 2017 dont think bearings is an issue then, when bearings go, the knock will get louder as oil thins out from heat, you will have less oil pressure also. Injector knock or cracked flex plate diagnosis w 2009 chevrolet duramax lmm dually.

Fuel knock and black smoke after replacing injectors. Those factors ensure that when the engine starts and the driver puts it in. Engine build variation from engine to engine contributes to differences in perceived volume. I hadnt removed the inspection plate yet to see if i had a broken tq converter bolt or a cracked flex plate. I also ended up dropping the upper oil pan as well. This saturday i slid the torque converter off the flex plate and got the engine hot. If the alarm has been activated, it must be reset in order to turn it off. The truck has a lift kit and dealer told me not covered under gm warranty, etc. Chevrolet silverado 1500 questions loud knocking noise 5. This is a must with the high torque in conjunction with a better designed torque converter that can transfer the torque with no. Injector knock or cracked flexplate diagnosis series featuring my 2009 chevrolet duramax lmm dually. Duramax lmm diesel engine knock unplugging injectors manually.

Socal duramax billet flex plate danville performance. Usual failure mode is the crankcase bolts or the torque converter bolts work loose, allowing the parts to start moving in different directions, the clicking sound you heard. These units are a direct boltin and fit any oem or aftermarket torque converter. Those flywheel bolts are really tight, and they require a 14mm allen wrench driver.

I have had a lly with a cracked piston, the blowby gave it away. I have a loud knocking noise coming from the engine. Just got off the phone and was told it has a cracked flywheel. As a result, this can cause the flexplate to wobble.

The reason for the sound involves the flexplate s location and its function. It runs fine in park but in any other gear with my foot on the brake it has a very noticeable, almost loud knocking sound. To determine if the flexplate is cracked for sure the transmission would have to be removed to inspect it. Even though the 0610 duramax s are equipped with slightly stronger, forgedsteel rods than what was used in the 0105 engines lb7 and lly, the problem moves upward, into the pistons, on the lbz and lmm engines. Definitely sounds like its coming from under the hood. Oil filter was clean no silver in the filter that was noticeable on the element and very very little residue on the filter mag. Duramax 0104 lb7 billet flex plate socal diesel inc. I was told by several people it could be a cracked flex plate. It threw me off because it sounds like its coming from motor by the fire wall from inside unless you stick your head by the floor you can hear it. I really hope thats what it is, and that the noise will go away when replaced. I took in my 2005 chevrolet duramax diesel to dealer with. The sound is very similar to a bad connecting rod and is often misdiagnosed. Powered by the lmm duramax 365hp660tq coupled to the mw7 allison 6speed through the np1 np263xhd transfercase. Most cracked piston scenarios play out at power levels well beyond stock roughly 650 to.

Just crawled under and were the tranny hooks up to the motor it has a knock, like its dieseling. If so, more than likely its just the triple clutch setup makeing noise in the converter. After they checked it out, they said it was a cracked flex plate between the tranny and engine, and that this is a known issue with gm. All 6600 duramax tm diesel engines have this condition. The classic and most obvious symptom of a cracked flexplate involves the sound it makes while the engine is running. I would take that cover off and turn the flywheel by hand to see if you can see a loose bolt.

Give a guess in the comments section and stay tuned for pt. High to low socal diesel billet flex plate 20012005 lb7lly. I told them for the amount of miles these parts should not have broken, etc. Common issues and problems we see in the shop with the lb7 6. My uncle thinks it may be a cracked flex plate from how i described it to him. I wasnt even thinking the fly wheel since i hear the noise the best with the hood open. The sound is very similar to a bad engine rod and is often misdiagnosed.

This flex plate is twice as thick as stock and has passed the stringent 29. Over the years these trucks have been really good performers, but they do have some common problems. It bolts to the end of the crankshaft and the transmissions torque converter bolts to it. The sun coast a1bfp billet flex plate for your 20012005 gm 6. With increased torque from the engine, it can crack andor rip the center out of a stock flex plate. I had a 86 k20 t400 350 gasser company truck that would break the center out of the flexplate every 5000 miles.

Sometimes you can actually get a little movement of the flywheel just before the torque converter moves. The one i heard was on my brothers 89 34 ton ext cab with a 350. When additional horsepower and torque are added to your duramax, you run the risk of cracking the stock flexplate. I have had one do that before, and it sounds exactly like what you are describing. Fits 0615 lbz, lmm, lml this replaces the factory flywheel flex plate with a improved bil let steel one piece design and eliminates the heavy cast iron and the weak stamped steel flex plate. Featured items newest items bestselling alphabetical. Loose torque converterto flywheel or flywheel tocrankshaft bolts will sound similar to bearing knock. Dec 28, 2004 right off the bat, they said it didnt sound like piston slap. At first i thought it was comin from the top but when i get under it its alot louder sounds like its comin from the oil pan. All duramax tm engines are manufactured to very close tolerances to meet the durability and reliability standards.

The truck still runs great and doesnt effect performance at all. Finally, you might notice rhythmic clunking or grinding noises. Proposed the issue was the flex plate rather then the engine. To me it sounded like a mad woodpecker somewhere under the truck. I had the transmission rebuilt thinking it was the flywheel or torque convertor and wasnt the problem but transmission was in bad shape. If you only tow 5% of the time and this is a daily driver, then a 34 ton might be ok but it is no 12 ton as far as comfort and mileage. If you have ever changed a flywheel then the procedure will be familiar. No noise what so everi took the trans out and the flex plate looked like brand new with no cracks.

Common issues and problems we see in the shop with the lb7. How to know if a flexplate is warped it still runs. The flex plate replaces the flywheel in automatic transmission cars. Cracked fly wheel usually gets louder as it gets hotter, or under heavier load. I just thought id post a short video of what a cracked flexplate on a 6. The reason for the sound involves the flexplates location and its function.

In this video i talk about a noise coming between the engine and transmission. Now finally invesigated a slight knock that i couldnt tell if it was normal diesel sound or not. Your flexplate could also be cracked as well, certainly not unheard of on a 6. I only say this because it happened to my 2000 and the dealer told me i had an engine knock and that my engine was toast. Random rattling noise from bellhousing area the truck stop. I took in my 2005 chevrolet duramax diesel to dealer with cracked fly wheel and flex plate. Descriptions of the sound include clanking, chirping and a light knocking.

While various versions of the engine have surfaced over the years, all generations of the duramax are based on the same foundation. Designed to handle up to 1500 ftlbs of torque, the new duramax black oxide coated flexplate is corrosion resistent to prevent hydrogen embrittlement, billet machined and precision balanced for ultimate strength. A loose or cracked flywheel will produce an irregular thud or click. Jan 19, 2011 i just put a flex plate in my hd 2500 6. Ats diesel billet flexplate for gm duramax 20012004 6. Sounds like cracked flex plate, damaged torque convertor or transmission related. A mirror andor opaque color laser cut acrylic design is permanently attached to the stainless steel surface to create a threedimensional finish. The rear cover came loose pretty violently and ended up ruining the dowels in the upper pan anyways. Duramax 1116 lml billet flex plate socal diesel inc. A loose bolt on a flexplate or a crack between its bolt holes. Unlike other manufacturers, bd is reusing the stock flywheel assembly to reduce costs and unnecessary part changes. Broken or loose bolts on the crankshaft end of the flexplate, or on the torque. And probably, some lessthanawesome mechanics might even mistake said noise for an engine knock wristpin knock.