22R Introduced in 1975 and used til 1980, was the very popular 20R engine. In 1981 Toyota increased the cylinder bore diameter and released it as the 22R engine. All Toyota R series engines have an aluminum head, cast iron block, and a single overhead camshaft (SOHC) driven by the timing chain. The 20R and 22R engines were not used in any front wheel drive vehicles and can only be found in rear wheel drive vehicles.
As mentioned before, the 22R replaced the smaller bore of Toyotas 20R engine in 1981. Many engine parts carried over including the connecting rods, crankshaft, dual row timing as well as several other parts. The original 22R design lasted thru 1982. Toyota made several design modifications in 1983. Toyota redesigned many of the timing components including moving from the dual roller timing chain to a single roller chain. Toyota changed the 22R a great deal again in 1985 and that is why you will hear the 22R built before 1985 referred to as an Early 22R, and one built after 1985 referred to as a Late 22R.
The block is hot tanked, surfaced, and torque plate bored and honed. Head bolt holes are tapped out to ensure proper torque readings. New freeze plugs installed. Crankshaft is turned to next size. Crank is installed with TaiHo(O.E.M.) bearings. Connecting rods are re-sized on large end, cleaned, honed, re-bushed with new pistons and pins. All bearing clearances are measured and documented on a build sheet. Ring end gaps are all checked and recorded. Rebuilt engine w/out head, includes timing cover that was surfaced with the block.
Standard rebuild longblock
Rebuilt engines have the block hot tanked, surfaced, and torque plate bored and honed. Head bolt holes are tapped out to ensure proper torque readings. New freeze plugs installed. Crankshaft is turned to next size. Crank is installed with TaiHo(O.E.M.) bearings. Connecting rods re-sized on large end, cleaned, honed, re-bushed with new pistons and pins. All bearing clearances are measured and documented on a build sheet. Ring end gaps are all checked and recorded. Installed timing set is O.S.K.(what Toyota uses).Includes new timing chain, tensioner, sprockets, and guides. Japanese head gasket with new head bolts. Head is remanufactured, surfaced, line honed, with reconditioned valves and springs, pressure tested, new valve seats where needed, new seals, and polished stock camshaft. Rocker shafts and arms are replaced with new arms and shafts. *Now all 20R, 22R, 22RE Long Block engines come with OEM Aisin water pump installed.
