Diesel Rockerarm Hardware

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Cummins 24V Rockerarm Trunnions

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HD Billet Tool Steel 24V Cummins Rocker Arm Trunnions

 


OEM rocker arm trunnions were originally designed conservatively and in recent years this has allowed for rocker arm and pushrod issues in applications where load or performance is exceeding OEM. When the stress on the trunnion rises above what is considered a reasonable window of operation, the trunnion is not designed to support the additional load it is experiencing. Stock trunnions begin to gall themselves ,as well as the rocker arm bushing surface soon after stress surpasses those OEM levels. Within a few thousand miles, it is common for the rocker arm to seize itself to the trunnion. In effect, bending the OEM pushrod, which can cause severe damage to the engine.

Our heavy duty trunnions feature larger oil supply holes, increased oil groove width and two additional oil transfer grooves along the bottom. The increase in oil will provide a more adequate amount of oil to feed a hydrodynamic wedge, which is a very thin film of oil that reduces friction by allowing the rocker arm bushing area to never contact the trunnion. Thus, increasing service life of both the rocker arm and trunnion.

Just the improvement in design wasn’t enough, we CNC machine our billet trunnions from premium tool steel bar stock. After which, they are core hardened, precision ground and nitrided. Our combination of materials, precision machining and heat treatment process’ provides a cost effective solution for extending the service life of your OEM rocker arm bodies.

Each set of trunnions comes with a rocker arm refinishing kit to polish the galled rocker arm bushing surface before putting your new, heavy duty billet tool steel trunnions in the rocker arm bodies.
Trunnions are kept in inventory and are ready to be drop shipped from our facility the same day you order!If you require additional assistance, please call (951)245-6565 or Email Techline@mantonpushrods.com.

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Powerstroke Lifters

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6.0/6.4/7.3 Power Stroke Hydraulic Roller Lifters

With an increase in requests from our customers upgrading their pushrods and other valve train hardware, we felt it was about time that we stock a replacement hydraulic roller lifter. We have found a reputable supplier of 6.0/6.4/7.3 lifters; Morel, a performance manufacture of lifters that has been well established in the industry since 1992.

These power stroke lifters are manufactured to standards that exceed the OEM call out. Each lifter has individual leak down testing performed on each hydraulic unit. This is done to ensure the leak down rate meets or exceeds the OEM specification. The load and speed rating of the needle bearing used in this Morel lifter is designed for use in stock to mid performance applications and is not intended for use in engines experiencing extreme abuse. We would highly recommend a solid body roller lifter for customers who feel they would exceed the capability of this lifter.

If you have made any modifications to your engine, we suggest checking pushrod length to ensure the preload in the lifter is correct. Changes to the head gasket , desk height and cam shaft base circle, along with other factors can cause your OEM pushrod length to become different from what is required with your specific combination. We offer power stroke pushrod length checking tools with proper ball radius to mimic stock. Once you have the correct pushrod length, this allows us to custom build a pushrod to the correct length required for your engine. We can custom build these pushrods in 2-48 hours after receiving your order.

6.0/6.4/7.3 hydraulic lifters are in stock and ready to ship, and can be drop shipped from our facility the same business day!

If you require additional assistance, please call (951)245-6565 or Email Techline@mantonpushrods.com.

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Duramax Rockerarm Shaft

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2001-2016 6.6L GM Duramax Rocker Arm Shafts

With the increasing number of people reporting lifter and camshaft issues, we felt it was time to find the culprit and fix it. We followed the oil supply chain and it pointed directly to the rocker arm shaft for being the source of the these issues.

Our Duramax shafts feature a new type of radial oil transfer passage which provides full time oiling to the roller lifters via the adjusting screw and pushrod. Without this new oiling feature, the stock oiling passage in the shaft is shut off as soon as the rocker arm starts to open the valve. This can be seen when the lifters are taken apart ;The bushings will be discolored from excessive heat. In effect, any oil that reaches the bushing at this time is being overheated, contaminating the oil supply with damaged oil. All of our rocker arm shafts use a threaded plug to seal each end, eliminating any chance of an oil pressure loss from worn or poor fitted press plugs.

With valve train stability being of additional concern, we manufacture our shafts to be very stiff to provide additional support to the aluminum head. Our choice of material is .250′ wall thickness 4130 chromoly steel tubing. Each pre-heat treated shaft is CNC machined in a four axis milling center before being hard chromed and ground. We leave a hard chromed surface providing excellent wear protection in any application, including use in your daily driven Duramax.

All in all, this shaft was engineered to provide a cost effective solution for increasing service life and performance of the valve train system.

If you require additional assistance, please call (951)245-6565 or Email Techline@mantonpushrods.com.

**Engine Dyno testing shows HP gain of 2-3 average across entire power curve**
**Works with OEM and aftermarket valve train components**

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Valve Bridges

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Extreme Duty Billet Tool Steel Valve Bridges

OEM Valve Bridges were originally designed for stress levels that were nowhere near what is being seen in recent years, which has allowed for rocker arm and pushrod issues to arise in performance applications. When the stress on the valve bridge exceeds what is considered a reasonable window of operation, it is not designed to support the additional load that it is experiencing. Therefore, we felt it was time to provide the industry with extreme duty valve bridges capable of far more abuse than anything the market has even seen.

Improved strength , performance and service life are goals of ours during our engineering process. Therefore, we CNC machine our valve bridges from only premium “hot-working” tool steel bar stock. After leaving the milling centers, the valve bridges are all hand inspected before being sent to heat treating for core hardening. Once returned from heat treating, each valve bridge is inspected before having the friction pad surface ground, which removes any tool marks that may cause excessive wear to the rocker arm. Bridges then have their surface nitrided, creating a very slick and hard surface to provide excellent wear protection and reduction of friction. Our combination of materials, precision machining and heat treatment process’ provides a cost effective solution for reducing friction and extending the service life.

Last but certainly not least, correct pushrod length will allow you to keep stock rocker geometry, allowing the friction surface of the rocker arm to ride the correct contact area of the valve bridge. If you have made any changes to the engine requiring custom length pushrods, we sell pushrod length checking tools with proper ball and cup radius’ to replicate the OEM pushrod in all diesel engines.

If you require additional assistance, please call (951)245-6565 or Email Techline@mantonpushrods.com.

We currently manufacture valve bridges for 6.0 & 6.4 Power strokes, 24 Valve Cummins & 6.6 Duramax. If you require a custom valve bridge for an engine that we do not currently manufacture them for, we will be happy to quote you on a price. Minimum quantities may apply for custom valve bridges orders.

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Diesel Rockerarm Adjusting Screws

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Similar to our custom adjusting screws for the racing market , our diesel rocker arm screws are made of H-13 tool steel that is heat treated, triple tempered and nitrided for wear resistance. This combination of materials and heat treating procedures makes the most durable and reliable screws available on the market. All of our screws are manufactured with rolled threads and broached to accept an allen wrench. Manton makes custom screws on request, available with or without oil holes for pre-lube as well as oil grooves for pressure fed oiling; Minimum quantities may apply. Depending on the style of screw and application, proper installation instructions will vary.

Duramax engines will use our part D-838 , featuring a pressure fed side oil hole. All pressure fed adjusting screws need the oil band positioned properly so oil can flow around the oil band and into the side oil hole of the screw. This is very critical due to the fact that, if not aligned correctly, lifter and camshaft failure will occur.

12 valve Cummins with stock rocker arm configuration would use our part number #D-828 , and 24V will be our part D-837. Our screws feature stock length , thread pitch and ball radius’. Cummins rocker arm adjusting screws are usually positioned with their ball 2 to 3 threads sticking out of the bottom of the rocker body. Any deviation from the stock adjusting screw position will result in changes to the rocker arm ratio, affecting lift at the valve. These instructions may vary from one engine combination to the next, so it may be a good idea to call us or the rocker arm manufacturer for more specific details.

Pre-lubrication of these screws before use is very important. It is recommended that a high zinc content assembly oil be used to prevent galling on the initial start up. Do not use anti seize of any kind on pushrod tips and adjusting screws. Anti seize contains soft metal particles that turn into an abrasive at a high temperature and doesn’t allow the engine oil to coat the friction points properly.

To go along with your adjusting screw, we offer poly lock jam nuts, featuring a light weight 12 point design. They are designed to mate perfectly with our diesel adjusting screws and the surface of the rocker arm body. For customers who purchase D-838 Duramax adjusting screws, we suggest pairing them with our D-852 jam nut with our D-828 & D-837 screws we suggest pairing them with our D-851 jam nut.

If you require additional assistance, please call (951)245-6565 or Email Techline@mantonpushrods.com.

We currently manufacture valve bridges for 6.0 & 6.4 Power strokes, 24 Valve Cummins & 6.6 Duramax. If you require a custom valve bridge for an engine that we do not currently manufacture them for, we will be happy to quote you on a price. Minimum quantities may apply for custom valve bridges orders.

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