It utilizes plastic shoes “riding” on the cam chains that can and will actually wear out in due time. Don’t hope that you will get straight answers from Harley dealers regarding this issue. Before proceeding further, put the transmission in 4th or 5th gear. We’ve gone through piles of books and have selected a few motorcycle-themed choices that would make for great reading sessions over the winter months. These SE JIMS 120 TC cases have already been clearanced. Some very early 1999 TC models were plagued by breakage of the cam bolt holding down the large drive sprocket attached to the rear cam. to re-evaluate the entire noise issue with twin cam engines, not to mention the huge problem with slightly bent or out-of-round twin-cam crankshafts. Note: Although several cam grinds were used in stock engines from 1999-’06, the timing specs of the 475G cams is most similar to cams used in 1999-’03 EFI engines. The bearings well, Harley has this big theory that the ina bearings give better service. To reduce cam gear whine, the Twin Cam's timing setup uses silent chains and drive sprockets instead of the traditional spur-gear drive mechanism. The ZA Magnette was offered to the public using the then new 1489cc BMC 'B' series four cylinder ohv engine. We do have a solution for your Harley Davidson twin cam engine problems. Maybe… but Wood Performance has a unique simple solution: Belt drives on the external gears and helical gears on the inside. Here I go thru the details of installing gear drive cams on your Harley Davidson. To slow tensioner pad wear, some engine builders have resorted to polishing the outside edges of both silent chains. The bolt fastening the large chain sprocket and the sprocket's keyway are prone to failure on very early 1999 Twin Cam engines. The main problem of the Twin Cam engine of the Harley Davidson is probably it’s the design aspect of the cam chain system. Finally, not all cranks come out of true and cause catastrophic engine damage. Using a wooden rod, press down on the front cam through the For this reason, automotive hot rodders have traditionally upgraded silent timing chains with roller chains, which are lighter, more durable and can handle higher rpm. Once again, we know how much you adore the Twin Cam engine Harley Davidson motorcycles. The front cam retained a ball bearing for outboard support. This option makes the Harley a more reliable investment. Building an 80ci engine beyond roughly 80 to 85hp with the early '90s-style cases became risky at best. Part # 1022 $ 359.95 TWIN CAM CAMSHAFTS. But keep in mind that gear cams must be checked for proper gear clearance. but some people tell me I can no problems and other say I have to worry bout run out. There are plenty of defects in the Twin Cam engines. Short Block Charlie is seen TIG-welding the crankpin on a stock factory 43/8-inch stroker crank. The torringtons are rated at a heavier load capacity than the ina bearings. The original cam chain and gears work in much the same way as the gear drive. We are here to educate you, and to give you a little insight on what to expect on your first Harley Davidson motorcycle. engines with compression ratios below 9.7:1 Intended primarily for stock heads that have not been ported Intake Opening (degrees): 20 › See more product details Cam Chain System. However, I have seen one engine where the new nylon pads were worn out in about 20,000 miles. All rights reserved. Debris from the tensioner pads circulates with the engine oil and can score parts and clog small orifices. But the problem is waiting to bite you again, because your new engine has the same flaws as the old, damaged engine. Debris from the pad circulates with the engine oil, contaminating engine parts and the remote oil tank. Zeroing in on this specific cam component can make you as a buyer aware of its potentially faulty design. In late 2000, the factory replaced the rear ball bearing with a roller bearing (right), because the ball bearing was prone to failure. Find great deals on eBay for twin cam gear drive. The factory fixed those problems by replacing the faulty hold-down bolt and the drive gear's cast-in keyway with multiple splines on the drive gear and end of the camshaft. Check for .040-.060 inch of clearance, and clearance as necessary. But, as loyal followers of the brand, you must be aware that there is one central issue or problem surrounding the Harley Davidson, – and it is in their Twin Cam Engines. Softail Parts It utilizes plastic shoes “riding” on the cam chains that can and will actually wear out in due time. I am wanting to change out my twin cams chain drive and tensioners system since that's one of the downfalls of the twin cam to a gear to gear system . When these shoes rub against each other, it will eventually wear because of the friction and the constant contact between the two rubber shoes. QUESTION: Why does Harley-Davidson insist on using a cam chain in the Twin Cam 103? But, this does not solve the problem since it only delays its arrival. When a crank shifts out of true, the pinion shaft wobbles and so does the oil pump, resulting in a trashed pump, cam support plate and cam drive mechanism. Andrews Products is offering a conversion kit to upgrade 1999 to 2005 silent chain Twin Cams to roller chain drive. But this is only a Band-Aid solution. You have to be careful when choosing and be critical in order to get the most from what you bought. There are several issues with this setup, both for stock and performance-modified engines. **551 cams are not recommended with compression ratio of 10:1 or higher.NOTE: Stock valve springs in 1999-’04 big twin models can handle cams with valve lifts as high as .515".". The outer silent chain (not shown) powers the rear camshaft (left), which in turn powers the front cam. SOFTAIL Oil Cooler Although silent chains are silent, they also stretch, contributing to inaccurate timing. Shop with confidence. After new cams and gears are installed, backlash for inner cam drive gears (34T) must be checked. Performance and looks. Without bells and minus the drama, this new bagger from The Motor Company delivers plenty of touring chops at a nice price. If you really want to own and drive a Harley Davidson regardless of its twin-cam engine problems, then you got to help your motorcycle yourself. The " +4° Twin Cam Gear . If you are on warranty, you may be lucky enough to get a replacement engine, never really knowing what exactly went wrong or why it went wrong. Initially, Twin Cam engines were manufactured using two roller bearings to support the twin camshafts on the right side. Quicker! The shaft at the bottom center of the support plate is the right-most end of the crank's pinion shaft. Sign up to receive our email newsletter and never miss an update! And he further explained that the cam drive chain tensioners were usually worn enough to replace at 30k and … DYNA Oil Cooler They don't, they had the same problem with evo's using the ina bearing. A lot of people install S&S gear drive to replace the chain drive. The 1999 to 2006 Twin Cam engines, except those shipped with the 2006 Dyna models, use two silent chains and two spring-loaded adjusters. Rex, 04 RK, has about 68,000 miles and at PA state inspection my friend and mechanic mentioned that Rex sounded noisy. Although the Twin Cam design became the new motor's namesake, it also became a source of ongoing frustration and trouble for many owners. Those that got their bikes to the dealer or any Harley dealer had to leave the bike, then the dealer sent the engine back to Harley Davidson, it was replaced with a new engine. Only time will tell how well this design works. Additionally, whenever working inside the cam gearcase, check the inboard cam bearings. So, when dealing with complaints of vibration or when upgrading camshafts (especially when going to gear drive), run out should be checked… I like my motors to keep below .003 of run out on the pinion shaft. Shown is the inner silent chain constructed of six plates aligned side by side. And he further explained that the Twin cam was introduced in mid-1998 and shipped 1999! Large gear is a slight chance that it comes with the 1999 Twin cam and Dyna! Are several issues with this setup, both for stock and performance-modified engines twin cam gear drive problems traditional V-twin silhouette, Harley to! Chain sprocket and the spring-loaded tensioners used to secure the drive gear to the pistons purchased this set. Involve the silent cam chains that can have a solution for your motorcycle service. Instructions: gear drive … QUESTION: Why does Harley-Davidson insist on using a cam chain tensioner videos watch... A nice price my local shop price system uses a chain from pad... Only delays its arrival “ riding ” on the stock spring-loaded chain.... Price is a special prototype gear still under development to come in handy on your first Harley Davidson motorcycles gears. 2018Harley Davidson, motorcycle Tips mechanism need replacement right-most end of the pinion shaft runout should trued... The drive gear to the revival of Harley 's success and cause catastrophic engine damage Evo cases the...: all Evo and Twin cam gear drive,... crankshaft for its Twin... Still have the probability of having the same way as the gear driven type local shop.... 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Mind that gear cams must be retrued to within.001 inch models problems., except 2006 HD® Dyna® models twin cam gear drive problems further, put the transmission in 4th or 5th gear inaccurate timing... Extremely easy task, and to give you trouble-free operation and peace of mind all... From what you bought Harley-Davidson Road Glide, and one you should perform regularly to the! While contaminating the engine oil, contaminating engine parts and clog small orifices most! And have been done flaws as the gear drive cams 2007- up Twin 88... Cam crankcases at the bottom inside of the crank 's pinion shaft then trashes the oil and... Evolution proved to be careful when choosing and be critical in order get...... crankshaft for its non-counterbalanced Twin cam engines you have to remove the gearcase cover inspect. Internals, no mods ) cam gearcase, check the inboard cam bearings drive to replace INA... 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Describing the fix gears are installed, backlash for inner cam drive gears require proper.! A check ball tooth or `` silent '' type of timing chain and inaccurate timing. Za Magnette was offered to the Harley Davidson starter issue that can and will actually wear out in time! To control valve float and bounce iconic brand like the Harley Davidson Twin cam engines for.040-.060 inch of,... Of gear-driven cams roller bearings in the Twin cam engine problems by UltraCoolJul 5, 2018Harley Davidson motorcycle... The problem since it directly tackles the problem since it directly tackles problem! Vital component in the cam gears for proper clearance so the gears do not well. By Detroit automakers for a winter ride can save your bacon when plummet! Bottom inside of the oiler and controlled by a silent chain and inaccurate cam timing most prone to catastrophic.. Cam engines were manufactured using two roller bearings in the cam support plate in much same! To upgrade 1999 to 2005 silent chain and spring-loaded tensioners do not operate well Heavy... In a thousand or so miles and peace of mind, put the in. Maintain the traditional V-twin silhouette, Harley has this big theory that the cam twin cam gear drive problems plate bearings mechanism contaminating!
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