Weve had a few forum members get broken flex plates in the last few years. How to know if a flexplate is warped by chris stevenson. It will sound almost like an engine knock but will be heard from the area between the front of the transmission and rear of the engine. My 04 chevy silverado has broken the flywheel 5 times. Easy fixed by just unbend the plate between the fly wheel and the starter. Noise in my chevrolet silverado sounds like flywheel. Can i install a billet flywheel and eliminate the flex plate. Symptoms of a cracked flexplate welcome to modern mopar forum.
Flywheel resurfacing is a process where it is run through a machine to make the surface of the flywheel smooth and take out any indentations that could cause the noise. Sometimes you can actually get a little movement of the flywheel just before the torque converter moves. Proposed the issue was the flex plate rather then the engine. A cracked bell housing is caused by worn transmission andor engine mounts causing excessive vibration or movement which eventually will cause the bell housing to crack. Once registered and logged in, you will be able to contribute to this site by submitting your own content or replying to existing content. I have seen on occasion the torque converter bolts get loose and. I had the transmission rebuilt thinking it was the flywheel or torque convertor and wasnt the problem but transmission was in bad shape. One of the most serious crankshaft position sensor symptoms. The sound is very similar to a bad engine rod and is often misdiagnosed. I have a loud knocking noise coming from the engine. In the past few days my 94 has been knocking while in gear and at low rpms.
How to know if a flexplate is warped it still runs. Hello, i own an 03 ford focus and have had the engine replaced twice in the past 6 months as well as two cracked flexplates. Im pretty damn sure i broke my fourth flexplate on the truck. I have had this truck for almost four years now and i have now broken two flexplates within 4 months of each other. The flex plate is a steel plate that bolts to the rear of the engine and has gear teeth. After removing the flex plate and looking at it i still could hardly make out the crack. Come join the discussion about silverados, sierras, and other full size trucks performance, modifications, suspension, lift. A maual transmissions flywheel that is cracked will generally cause the cluth to slip, and eat the clutch disc rapidly. This is a 1999 gmc sierra 1500 with a loud noise coming between the starter and the flywheel. The crack was in between the crankshaft mounting bolt holes.
Clutch chatter can come from burned or glazed clutch disc friction material, a worn pilot bearing or bushing, or damaged or distorted clutch disc. I just thought id post a short video of what a cracked flexplate on a 6. Descriptions of the sound include clanking, chirping and a light knocking. Gmc sierra 1500 loud noise coming from the starter and flywheel fixed duration. Months ago the overdrive light on the column shifter. Cracked flexplate how can i tell the chrysler minivan. I had am issue with my chevy silverado and after your video i sent and took it a. Flex plate again chevy and gmc duramax diesel forum.
Those factors ensure that when the engine starts and the driver puts it in. Youll be able to customize your profile, receive reputation points as a reward for. Its purpose is to absorb and reduce harmonic vibrations from the engine as the crankshaft rotates, as harmonic vibrations at high engine speeds can cause accelerated wear and damage to the components. The crankshaft harmonic balancer is a device connected to the front of an engines crankshaft, usually built into the crankshaft pulley. They are breaking the center piece with the 6 bolts right out of the center of the flexplate.
Next day try to start it, sounded like a weak battery or starter but car started. If you have a knocking noise from your engine it might not be the engine itself. 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. The problem turned out to be a cracked flex plate which. The same things that cause the flexplate to crack can also cause transmission problems. At about 5 miles from home my flex plate was cracked. In 20 seconds you can become part of the worlds largest and oldest community discussing general motors, chevrolet and gmc branded pickups, crossovers, and suvs. The flexplate has cracked twice in the past 6 months.
Attached is a video of the startup and idle of the flexplate disconnected from the torque. Its possible the rear exhaust manifold or even the crossover pipe cracked and developed a leak. If its an automatic, i bet you find either the bolt holes from flywheel to flexplate or flexplate to torque converter cracked. I have had a quick look through the starter motor hole and checked that the bolts that hold the torque. Symptoms of a bad or failing crankshaft position sensor. It would be safe to drive it home or to a repair shop, but i would have it replaced asap.
At this point, normal engine combustion pressure is disrupted, which in turn, lowers engine compression and results in poor engine. The reason for the sound involves the flexplates location and its function. When stripped down, the plate had split around all 6 bolt holes. Ive gotten a lot of different reasons as to why the shops think its happening and am gathering all the information to pinpoint exactly what it is. Symptoms of a cracked flexplate general discussion. The classic and most obvious symptom of a cracked flexplate involves the sound it makes while the engine is running. Then ive seen people say there is a gm service bulletin out over trucks assembled in mexico using the wrong master cylinder and a revised replacement part has to be used, a clutch swap has been done with little change in symptoms, etc. Did a log, no st or lt knocki have a pretty conservative tune. Im thinking it is a specific diameter or teeth selection. Nothing has changed as far as mods go to the enginedrivetrain or suspension for a long time. Loose torque converter bolts and cracked flex plates. A warped flexplate can make metaltometal contact with the inspection plate cover, or the starter drive mechanism. Someone told me yes but, it is a pain to bolt up the t. This time around, i know they make an sfi approved flexplate that will handle anything, and im putting the sucker in.
Chevrolet silverado 1500 questions loud knocking noise 5. A cracked engine block can result in low engine compression if the crack is severe enough andor deep enough within the engine block to pierce any one of the engine cylinders. This is the cheaper option, although if there is damage on the flywheel and it is cracked. A cracked flex plate is almost always a sign of other problems. If you are talking about a flywheel for a manual transmission equipped car, the most obvious symptom of a cracked flywheel is a knock. What are the signs of a cracked flywheel in a 1998 chevy. Here we are swapping out a transmission due to a broken flex plate. If it really is the flex plate, thats a lot cheaper than other problems that could cause a bad knock. The symptom starts with difficulty in starting and leaves the car dead one day if you dont get it fixed. An oespec replacement dual mass flywheel will restore the vehicles stock performance and feel. Sold 2008 chevy k3500hd cclb ltz with lmm dmax sold 2004. The most common symptom associated with a bad or failing crankshaft position sensor is difficulty starting the vehicle. What causes a flexplate to crack twice after two replaced. Just wondering what your guy symptoms were when it went out.
The downside, of course, is the cost, as replacement dmfs are generally much more expensive that single mass flywheel conversion kits if a conversion kit is available, of course. Its one of the most serious crankshaft position sensor symptoms. Does anybody have a link to the sfi vortec style flexplate. Convert from a dual mass flywheel to a single mass flywheel. My uncle thinks it may be a cracked flex plate from how i described it to him. A loose bolt will hollow out the hole, and can cause a crack from the hole toward the middle real hard to see. 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.
When a flexplate cracks, it often produces a loud knocking noise as it rotates. A reconditioned transmission was installed by a transmission specialist 6 months ago. A cracked flexplate is almost always a sign of other problems. Gm performance view topic broke my fourth flexplate. Had this little problem on an dare i say it land rover automatic. It sounded like a big end knock at idle, went quiet when put into drive. I have a 1993 gmc sierra 2wd with a chevy 350 small block. What are the signs of a cracked flywheel in a 1998 chevy 350 engine. I know banks makes a flywheel and ats makes the flexplate. Damaged and leaking front seals and front transmission pumps are common symptoms. Looking for repair information or to purchase this vehicle. I feel like my flexplate is going bad in some way havnt checked fully yet, what are all of the symtoms of a bad flexplate. Register now to gain access to all of our features. Symptoms of a bad or failing crankshaft harmonic balancer.
Ive seen comments as simple as someone had the same symptoms and swapped the clutch and it drove like new. A forum community dedicated to gmc and chevy full size owners and enthusiasts. Furthermore, if not properly diagnosed it will occur again and often damage to the transmission may follow. Well before i answer that question, let me point out that while a series 1 na or sc flexplate might bolt up to a series 2 engine, the balance is different so. Broken or loose bolts on the crankshaft end of the flexplate, or on the torque converter side, missalign the flexplate, causing a high side of the plate to strike or rub against internal components. Gmc sierra 1500 loud noise coming from the starter and flywheel fixed. The computer receives a malfunction code when the sensor is completely gone. Usually, a problematic crankshaft position sensor will produce any of the following 7 symptoms that alert the driver of a potential problem that should be serviced. Aside from a manufacturing defect, the only things that will cause a cracked flex plate are improper torque on the plate bolts at the. My 04 chevy silverado has broken the flywheel 5 times within a year. Grooves in the flywheel and missing or damaged flywheel dowel pins can also cause chatter, but flywheel related symptoms also mimic the symptoms of a bad engine mount. Evening folks, my 300tdi auto today developed a nasty intermittant knocking, that seems to be coming from the bellhousing area. In this video i talk about a noise coming between the engine and transmission.