Yamaha ME421STI service

[kubcat]

After 2 months of anticipation, the Ribtec 890SX has finally arrived.

There has been some minor damage from the shipping that needs attending to but in the meantime as it sits in my garage we would like to service the engines and drives.

We have been assured it has been serviced religiously but it was in Papua New Guinea and we doubt anyone really new what they were doing.

Being in Australia, these motors are quite rare and not sure if anyone really knows what they are doing either so we are giving it a shot ourselves.

Besides fluids and filters, is there anything else we should do?

[biffer]

Originally Posted by kubcat

After 2 months of anticipation, the Ribtec 890SX has finally arrived.

There has been some minor damage from the shipping that needs attending to but in the meantime as it sits in my garage we would like to service the engines and drives.

We have been assured it has been serviced religiously but it was in Papua New Guinea and we doubt anyone really new what they were doing.

Being in Australia, these motors are quite rare and not sure if anyone really knows what they are doing either so we are giving it a shot ourselves.

Besides fluids and filters, is there anything else we should do?

The engine isn't as rare as you think. It's basically a Toyota landcruiser lump. The weak bit is the drive. Make sure you do the oil changes regular

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[Nos4r2]

Originally Posted by biffer

The engine isn't as rare as you think. It's basically a Toyota landcruiser lump. The weak bit is the drive. Make sure you do the oil changes regular

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Yep, also as fitted to the Toyota Surf,(it's the KZN130 or KZN185 motor) which is apparently rather popular in Aus.

[BogMonster]

Originally Posted by Nos4r2

Yep, also as fitted to the Toyota Surf,(it's the KZN130 or KZN185 motor) which is apparently rather popular in Aus.

Does it also suffer from head/head gasket problems then? Surfs are fairly well known for it, though it's a good grunty engine.

[biffer]

Are not the surfs 4 cylinder

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[Nos4r2]

Originally Posted by biffer

Are not the surfs 4 cylinder

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Erm, yeah I'm wrong-there's a 4 cyl 3.0 land cruiser which is the KZN130/185 lump and is also used as a marine engine by Nanni.For some reason I got it in my head it was the same lump.

[Nos4r2]

Originally Posted by BogMonster

Does it also suffer from head/head gasket problems then? Surfs are fairly well known for it, though it's a good grunty engine.

Not relelvant to the OP now, but the 2.4 Surfs suffer with cracking heads, not gasket problems. The 3 litre is a good lump.

[biffer]

I think the yam 165 hp was the 4 cyl one but the 240 hp was 6 cyl. If you pull the yam sticker off the top of the engine it still has Toyota cast in the top in 40 mm letters

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[martini]

Agree with Biffer, the leg is the weak link as with most diesel stern drives, generally 500 hours is the most you'll get out of one before a major overhaul is required. Under-propping the boat helps a lot by reducing load on the bearings and wear on the clutch.

They also can tend to get a bit too hot, many people either drill holes in the plastic top cover to help the flow of seawater through it or fit a drive shower.

Another thing to look out for on the motor is the cast steel mixing elbow. They quickly corrode on the inside which restricts the flow of water through it. A quick way to check is to squeeze the rubber hose feeding the salt water into the mixer at about 3000 rpm, if the hose is hard and under pressure the mixer is probably blocked. Stainless steel replacements are available from a few sources, expensive but then so are the Yammie ones and you'll only have to do it once.

[biffer]

Been making stainless exhaust elbows for these engines for nearly 10 years. The later ones from yam are stainless. I change my leg oil every 50 hrs

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