Looking at replacing pistons and rings in a 2007 rav4 with the i4 engine that's using oil. There are three part numbers listed for the pistons. They are listed as MarkA, MarkB and MarkC with part# ending in -A0, -B0, -C0. Is there any way to determine which is needed or are the original pistons stamped so that the engine would have to come apart to determine the correct parts?
grizztracks
I don't believe the piston options are for over bore. It appears it has something to do with the piston pins. You would think that the engine number or VIN would indicate what pistons are installed. I've worked on a lot of engines over the year and never ran into anything like this. I wanted to order parts before I tore it down but it looks like I'll need to measure the pins to determine which pistons to order.
Maybe toyota used piston matching to better fit the bores in this engine? They didn't do it in the V6 2GR-FE engine and people ended up with weird engine noises.
Was my response deleted?
If you look at the TSB, then Toyota does not tolerate a bore that has lost (or never had) cross-hatching and therefore the whole block is to be replaced.
No?
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If you look at the TSB, then Toyota does not tolerate a bore that has lost (or never had) cross-hatching and therefore the whole block is to be replaced.
No?
.
I've rebuilt many engines over the past 40 years. Everything from diesel trucks to powersports. I'm very familiar with the internal components of combustion engines. I'm just looking for some clearification on why Toyota has these variations. It's not a common thing that I've seen in the past.
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