Hi Folks, (re-edited)
1997 40th Anniversary 200k Miles
Early FZ80 (1993 - 1994) engines used a Ratchet Locking timing chain tensioner. This type of tensioner expands with oil pressure and then locks in place (PN: 13540-66010). This part number now subs to 13540-66011 (1993-1997), which is the non locking type.
The locking style chain tensioner helps keeps the timing chain quiet at start up (until the engine builds oil pressure). I do not know this specifically. Just from my research.
On my rig I had two internal oil leaks. The oil flow restrictor plug (the manual calls this an oil orifice) had backed out between the block and cylinder head, and the oil pump O Ring behind the timing cover (timing cover leak below the distributor and above the alternator). The timing cover O Ring was hard and brittle. I could hear the timing chain when the engine sound bounced off freeway sound walls. While I am not rebuilding my motor. I thought my timing chain had stretched or the tensioner had gone bad; hence the loud chain noise. So I replaced the chain, chain guides, crank/cam sprockets and the tensioner. The timing cover had to come off to fix the oil leak. The original timing chain, gears, and tensioner were all in spec (normal). Bummer. I am sure Toyota had a valid reason to eliminate the locking tensioner for the 1FZ motor. What surprised me was the number of Toyota engines still using the locking type chain tensioner (present day). I did not check/test my actual oil pressure. I just liked the idea of having the chain tensioner hold position all the time. Shame on me for second guessing the Toyota engineers... I mean why does the new land cruiser have a full lift hatch door? vs. a split tailgate. To quote another mudder. Maybe they don't prep/cook or make sandwiches with/in their rigs.
After searching other Toyota models, I found PN: 13540-75020 which is a near match dimensionally. The difference being the width of a metal ridge. The diameter is identical The oil hole and tensioner position is the same. The mounting holes and angled flange cutout are the same. I replaced my oil pump gears and bypass spring as well.
Just FYI
1997 40th Anniversary 200k Miles
Early FZ80 (1993 - 1994) engines used a Ratchet Locking timing chain tensioner. This type of tensioner expands with oil pressure and then locks in place (PN: 13540-66010). This part number now subs to 13540-66011 (1993-1997), which is the non locking type.
The locking style chain tensioner helps keeps the timing chain quiet at start up (until the engine builds oil pressure). I do not know this specifically. Just from my research.
On my rig I had two internal oil leaks. The oil flow restrictor plug (the manual calls this an oil orifice) had backed out between the block and cylinder head, and the oil pump O Ring behind the timing cover (timing cover leak below the distributor and above the alternator). The timing cover O Ring was hard and brittle. I could hear the timing chain when the engine sound bounced off freeway sound walls. While I am not rebuilding my motor. I thought my timing chain had stretched or the tensioner had gone bad; hence the loud chain noise. So I replaced the chain, chain guides, crank/cam sprockets and the tensioner. The timing cover had to come off to fix the oil leak. The original timing chain, gears, and tensioner were all in spec (normal). Bummer. I am sure Toyota had a valid reason to eliminate the locking tensioner for the 1FZ motor. What surprised me was the number of Toyota engines still using the locking type chain tensioner (present day). I did not check/test my actual oil pressure. I just liked the idea of having the chain tensioner hold position all the time. Shame on me for second guessing the Toyota engineers... I mean why does the new land cruiser have a full lift hatch door? vs. a split tailgate. To quote another mudder. Maybe they don't prep/cook or make sandwiches with/in their rigs.
After searching other Toyota models, I found PN: 13540-75020 which is a near match dimensionally. The difference being the width of a metal ridge. The diameter is identical The oil hole and tensioner position is the same. The mounting holes and angled flange cutout are the same. I replaced my oil pump gears and bypass spring as well.
Just FYI
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