Replacing Oil Pump Intermediate Shafts - Engine Builder Magazine

Replacing Oil Pump Intermediate Shafts

By the time an engine needs a new oil pump it has had considerable wear.

Figure 1 - Tongue and groove shaft. The shafts on the right are new. The used shafts are representative of ones from an engine ready for its first rebuild.
Figure 1 – Tongue and groove shaft. The shafts on the right are new. The used shafts are representative of ones from an engine ready for its first rebuild.

By the time an engine needs a new oil pump it has had considerable wear. The cylinder walls, rings, cam and lifters all wear.

The material worn off all goes to the oil pan where some is washed out during the oil changing process, but a portion goes through the oil pump and to the filter. Pushing grit through the oil pump puts an additional load on the oil pump intermediate shaft.

The photos in Figures 1-2 show the two most common types of intermediate shafts, the tongue and groove and hex.

In both photos the respective shafts on the left are used. The shafts on the right are new. The used shafts are representative of ones from an engine ready for its first rebuild.

Both used shafts show wear and deformation when compared to the sharp, crisp lines of the new shafts.

In time, the deformation can become severe enough to cause slippage and engine failure. Replacement is inexpensive insurance.

Source: Melling Engine Parts

You May Also Like

Shop Solutions – January 2024

Before installing cam bearings, make sure to chamfer any oil holes and clean up back grooves of any sharp edges.

Engine Builder and Engine Pro present Shop Solutions in each issue of Engine Builder Magazine and at enginebuildermag.com to provide machine shop owners and engine technicians the opportunity to share their knowledge to benefit the entire industry and their own shops. Those who submit Shop Solutions that are published are awarded a prepaid $100 Visa gift card. Submit your Shop Solution at [email protected]. You must include your name, shop name, shop address and shop telephone number. Submitted Shop Solutions not published will be kept on file and reevaluated for each month’s new entries.

Shop Solutions December 2023

Check out the latest shop solutions from builders around the country.

The Impact of Fuel Type on Engine Performance

When it comes to choosing the right fuel for your vehicle, several factors should be taken into consideration. These factors include the vehicle’s engine design, manufacturer recommendations, intended usage, and personal preferences.

Component Cleanliness

It can’t be overstated how important the cleaning machines are in the modern engine shop. Shop owners who prioritize effective and efficient cleaning techniques will find success in a more streamlined process.

Billet Blocks and Heads vs. Cast Iron

Billet aluminum has a lower yield strength or higher modulus of elasticity, meaning it will flex, or absorb energy easier under tension or stress than cast aluminum, without incurring permanent damage.

Other Posts

Melling Performance 2024 LS/LT Parts Guide

Melling’s 2024 LS/LT Parts Guide is now available.

melling ls catalog
Melling Engine Parts Acquires QualCast

Melling Engine Parts has announced the acquisition of QualCast, a manufacturer and supplier of valvetrain automotive parts based in Nashville, TN. Qualcast offers all facets of valvetrain applications including heavy-duty, industrial, light and medium-duty, marine and performance.   Related Articles – Hendrick Motorsports Partners with GROB Systems – VP Racing Partners with Ida Zetterstrom for 2024

Shop Solutions November 2023

Many times, the flange diameter of the rod nuts will contact the radius around the nut seat on some rods. Some jobs may not warrant the expense of spot facing the nut seat on the connecting rods. In that case, it can be quicker and more effective to just machine a chamfer on the ARP rod nuts.

The CNC Landscape Continues to Grow Inside Engine Shops

Several manufacturers named automation as one of the biggest continuing trends surrounding CNC equipment these days, and it’s clearly a key contributor to a CNC machine’s ability to do more without human interference.