4g63 Oil Pump Pulley Drama

[19Eclipse90]

I modeled up the DSM drive gear shaft (helical) some years ago. While I'm sure it isn't exact, it is a pretty decent reference and should tell you what you need to know, dimensionally, about the DSM shafts. Dimensions are in millimeters.

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[bonkas]

Just wanted to update you guys on this.

This was my conclusion.
I had to replace the cam pulley as it was trash, I could only get a square tooth version not the round tooth version the motor originally had, I didn't realize this until much much later in the build and after receiving the new oil pump realized that my old pulley was not going to fit anyway (8mm vs 10mm oil pump drive shaft).

Confirming with a colleague who also has a g63b, he was running a square tooth belt also, so I know there MUST be a pulley out there that fits this pump but I am still yet to find one.

After ordering a second oil pump locally specifically for the model of vehicle the engine came from surprise, surprise same drama with different shaft size. None of the original parts fit.

In the end to make all this work I had had to go to a wider timing belt, different tensioner to fit the wider belt, machine down an EVO Crank and Oil Pump pulley to fit, and now all my belts line up, all teeth on gears are correct etc.

Sorry if this is a bit unclear, this build has been going on for about 2 years now so my memory is getting a bit hazy but the engine is now running as can be seen here:

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[ThunderChild]

Wonder if the g4js Kia optima motor would have the right pulleys, they have a squared 8mm timing belt tooth pitch vs the dsm round 9.5mm pitch. Idk the width of the top of my head, 29mm I want to say.

The castle plug is definitely a main issue I saw, it seems like alot of the hassle could have been avoided by using all 4g63 stuff, hard to say without having it in hand.

What kind of pump is that ? I've never seen one with the oil galley casting visible on the front? It's not an off brand is It?

This is a 2g pump. 1g just has a hump channel that the oil follows.
I'm assuming it's another relief valve, perhaps for the piston squirters?

 

[Omarcito787]

I am in the process of building up a early 6-bolt 4g63(G63B) and have run into an issue with the oil pump drive pulley.

Sorry to bump this, but I can get you the correct pulley for this OEM from Japan

 

[bonkas]

Wonder if the g4js Kia optima motor would have the right pulleys, they have a squared 8mm timing belt tooth pitch vs the dsm round 9.5mm pitch. Idk the width of the top of my head, 29mm I want to say.

The castle plug is definitely a main issue I saw, it seems like alot of the hassle could have been avoided by using all 4g63 stuff, hard to say without having it in hand.



This is a 2g pump. 1g just has a hump channel that the oil follows.
I'm assuming it's another relief valve, perhaps for the piston squirters?

The Castle nut is present on the original pump, my spare and this new one.

Sorry to bump this, but I can get you the correct pulley for this OEM from Japan

Please let me know the details on this, it seems there is a different pulley which is suited for a smaller belt so it will not foul with the oil pump housing. If you can give me a part number I can match it to the parts numbers I already have.