NATIONALbearingcross referencechartpdf

Our GMN Gap Seals are plastic and a great choice for washdown applications, such as food conveyors and food manufacturing facilities

What is the service life of a timing chain and how does having a chain drive cam benefit from a belt drive cam and vice-versa?

Bearing interchangemanual

No built-in ball bearing support. Has no RPM limits & Supports high torque needs: 609 to 14,060 Nm. Bore (ID) sizes: 38.09 to 220 mm (1.499 to 8.66 in)

This heavy-duty clutch (aka a hold-back clutch) is good for high torque operations and ensures motion freezes in place. Bore (ID) sizes: 15 to 40 mm. (0.59 to 1.73 in)

Nationalbearingcross referencechart

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The bearing interchange chart is meant to be a quick cross-reference guide. If you’d like more detailed information like precision, matching, preload, and more part numbers, use our automatic bearing lookup tool.

I own a 2013 Volkswagen Golf TDI. Just recently, I drove a one year NEWER 2014, VW, with a 2.5, 5 cylinder Sportwagon. The 2.0 TDI, and the 2.5 Gas Engine, get the SAME Fuel mileage in town. Its the TDI that saves fuel on the freeway. Yes, the 2.5 Gas engine has the timing chain, and will last the lifetime of the car. The TDI is economical on the freeway, but its HIGHER cost in the beginning, @ purchase, and it's timing belt maintenance/replacement, is why I am going to trade my diesel in, for the gas engine with its timing chain, very soon.

Bearingcross reference by size

SKFbearingcross referencechart

There's a good section on the TDI Club's FAQ about timing belts, as that's what Volkswagon uses on all their turbo diesels. A belt breaking on a TDI is catastrophic. As far as I know, most cars use chains and compression ratios low enough that there's no risk of piston heads smashing into an open valve should the chain break. You can't retrofit a belt system to use a chain, you wouldn't want to do the reverse, but I have seen people replace belts and chains with direct gear drives.

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I may not be 100% accurate but I think belts have expected lift time of 60k-100k and at 100k they should definitely be changed.

1 VEX bearings can successfully cross to both GMN SM and KH series of angular contact bearings. Contact us with any questions you may have.

We know that not every application requires super, high-precision bearings. We stock other industrial parts from quality brands.

No built-in ball bearing support. Good for large orders & low to high torque needs: 1 to 2673 Nm. Bore (ID) sizes: 2 to 240 mm (0.078 to 9.448 in)

Includes built-in ball bearing support. Supports HEAVY loads & has a high torque capacity: 53 to 588 Nm. Bore (ID) sizes: 10 to 60 mm (0.393 to 2.362 in)

The best protection for your bearing. Easy to install with a simple “drop-in” next to your bearing. No added space needed. CF seals offer 100% sealing efficiency against splashing liquids.

Bearing interchangedatabase

The amount of damage caused by a belt breaking vs a chain breaking entirely depends on the type of engine. Engines with really high compression ratios (performance cars that require high-octane fuel, diesels, etc) tend to have the valves and piston heads move such that they could come into contact if the cam stops opening and closing the valves. When a piston head smashes into a valve, you ruin the head, valve, and potentially other cylinders if pieces of shattered valve travel through the air intake system to the other cylinders.

Designed with grooves in the outer ring to offer more protection (than our L-type seal) against contamination and direct spray liquids. Liquid gets pushed out through outer grooves when in rotation.

They have been known to break but as Brian mentioned, that's very rare. I've also heard of a more common failure mode with chains where over time the metal stretches which alters the timing, so although everything runs, your car becomes de-tuned and to fix it, requires a chain replacement.

In the end: The chain is a stronger, longer lasting product, that is harder to diagnose and harder to replace. When and if it breaks, it will break catastrophically without as much warning. The belt is more regularly replaced and is more telling when it is near its end of life. It is usually easier/faster to replace. Balance between Durability / Maintenance / Costs

I think we covered this before, but I can't find it... Timing chains have much greater service lives at the expense of slightly more noise and friction, as well as a lot more damage if they break (but odds of breakage are much less than a belt).

Includes built-in ball bearing support. Supports MEDIUM loads & low to medium torque capacity: 53 to 267 Nm. Bore (ID) sizes: 17 to 40 mm (0.669 to 1.57 in)

Belts are quieter but are often less obviously worn before they break (chains stretch and loosen, belts tend to stay tight without damaged belt teeth up until the moment they snap). Timing belts are also less complicated (chains require an oil bath). Chains are generally stronger, so vehicles with timing chains often drive more than just the cam with the timing chain. Due to stretch, when you change a chain you MUST replace all the timing gears, as the teeth will wear to match the chain stretch. While not necessary on a belt driven system, a failed gear will cause a belt failure and, depending on your engine, could be very bad, so it's generally recommended to replace all idlers and gears in a belt system, too.