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| Http://www.4x4wire.com/toyota/news/doa_products/ | Short Cuts | ||||
| Author: Jim Brink January 2000 |
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In spite of their rugged design and inherint durability, Toyota's "R" series of engines suffer from one weak link, their timing chain guides. Beginning in 1984, 22R engines were equipped with plastic timing chain guides. While these reduce noise and wear, they are failure prone and breakage can result in catastrauphic engine failure.
Although plastic engine parts have some merit, producing less running noise and a lower production cost, the drawbacks sometime outweigh the benefits. What occurs on Toyota engines is breakage of the plastic guides, either due to fatigue or accident. When the timing chain is allowed to wail about inside the timing well, it occurs undue wear and tear. This wear is not only bad for the chain (and will in time, result in a broken chain) but for the timing cover, block, cylinder head, and oil pan as well.
To remedy the problem, DOA Racing Engines manufactures their own metal-backed guides. These guides are produced similarly to the units once produced by Toyota's OEM. Rubber on the face (chain side) of the guide limits wear and excessive noise. The result is a guide that is unbreakable, contributing to longer engine life.
In addition to preventing breakage due to the use of metal in their construction, the DOA guides also eliminate the possibility of the broken plastic pieces of timing chain guide falling into the oil pan and restricting oil flow to the oil pump pick-up.
DOA sells their metal-backed guides individually or in a complete timing set. Prices for the guides are $65. The set retails for $201 (1985-on) and $150 (1985 andearlier.
Be sure to check back in the following months here at 4x4Wire.com's ToyotaSection where we'll be detailing a 22R timing chain replacement utilizing DOA Racing Engine's guides and timing components.
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