UniCarriers Engine Parts
Aftermarket and replacement UniCarriers Engine Parts built to original equipment specifications. Browse our components to find the right part for your equipment.
We stock aftermarket UniCarriers Engine Parts manufactured to OEM-spec dimensions, so downtime stays short and you skip the OEM markup. Not sure which part fits your equipment? Contact us and we'll verify it before you order.
Category guides
Nissan Forklift Engines: H20, H20-II, H25, K21 and K25 Explained
Nissan's H20, H20-II, H25, K21 and K25 power industrial equipment under many different OEM badges. The H-series is an iron pushrod design with a timing chain; the K-series is an aluminum-head overhead cam with a timing belt. The two families share essentially no parts, and matching displacement — H25 versus K25 — is not a cross-reference. A magnet on the cylinder head tells you which family you have.
Nissan K21 and K25 Engines Explained
The K21 and K25 are four-cylinder industrial engines sharing an 89 mm bore and differing in stroke, at 2,065 cc and 2,488 cc. Both use an overhead-valve pushrod valvetrain with a rocker shaft and screw adjusters, a bathtub combustion chamber, a timing chain, five main bearings and a chain-driven side power take-off. Both run gasoline or LPG.
Nissan K21 and K25 Maintenance and Troubleshooting
Routine service on a K21 or K25 covers valve clearance set hot at 0.38 mm on every valve, a cold retighten of the head bolts and manifold nuts, belt deflection, oil and filter, plugs, air and fuel filters and coolant. Most running complaints trace back to compression, ignition or fuel, and a compression test separates them quickly.