98 GMC Bluebird B7 366 6.0 gasser

[Walterbus]

So I recently purchased this bus. I'm wanting to work on the engine, first by changing all of the fluids.
I was going to start with oil but got confused, do I have two oil filters on my bus? And why are they SO far apart? In the videos I've watched they usually sit next to each other. Is there a second oil pan somewhere? Why is one filter so large, and the other small? And why does one say 'lube filter'.

Sorry for the questions, just wanting to make sure I do this right so I don't brick my engine haha.

The very long one is next to an oil pan, the short one I didn't see an oil pan. If they are both filters, how do I go about changing the small one out? Wait until the pan is empty and change it when I docthe larger one?

Thank you for all your advice! I'm sure I'll be here a lot.

[magnakansas]

I think one filter for the engine and one for the transmission. It is also possible there is a filter for the fuel and the coolant system... use the numbers on the filters and use a search engine on the computer and see what comes back if you type in the numbers.

I have a fuel filter, a water separator, a coolant filter, a transmission oil filter, and an engine oil filter. this is for a diesel engine


you change those two filters -- unscrew one, clean the mounting base making certain there is not an oring stuck to the base, put a light film of oil on the oring, screw the filter on until the base makes contact with the rubber oring on the filter and then go 3/4 turn more... then stop....... dont tighten the filter until it is tight.

william

[cadillackid]

that short filter looks liek the on-rail filter for an allison transmission.. the MT643 and AT545 use that filter on the frame rail.. the 1794 filter is the engine oil filter..



both should be changed, that trans filter looks old..



the 366 Gasoline engine likely wont have a water separator or a coolant filter.. ive never seen those on the 366.



that 366 is a venerable engine.. it will SUCK the gas but she is easy t owork on and many parts that fit other chevy big blocks will fit it.. parts are still available for it readily..



-Christopher

[Walterbus]

I think you're right! It has an Allison 545 in it. I'm going to see exactly where it is, and where it goes to be sure when I pull it out in about 30 min, so I'll get back to you.

100% I agree with the trans filter being old as heck if it is that. Now do I use an oil filter for that? Because that's what comes up when I Google that filter. And I'm more than fine to change my oil without touching the transmission one right? I'm assuming when I change the trans fluid I'll change that filter? Also, the store gave me a Fram ph5 short filter, as long as it fits there's no big difference between that and the 2 quart one, right? I'd be fine using the smaller one?

Yea that's why I went with this over diesel, it's easy and nearly anyone can work on it.

Thanks again!

[Walterbus]

Yea I think it is for the transmission. Going to confirm it when I pull her out in a bit.

I'll update you!

[PorchDog]

You should order the long oil filter for the engine. When any of the GM gasoline engines were used in a medium duty application-- they used what we called the "truck" filter-- which was the long filter. It gives you another quart of oil for additional engine cooling, and just more filtration material. This long filter (same part number I am pretty sure) was used on 350 , 366, and 427 engines, but will fit any Chevy if there is sufficient clearance beneath the engine.

Like Cadillac said-- the 366 was a very tough engine, forged crankshaft, and other upgrades for truck use.

[Walterbus]

Okay so I followed it. It goes from the radiator, to that filter, then back to this pan. Past the oil filter and oil pan. I think the pan connects to the transmission, right? Photos attached.

[Walterbus]

Do you know what filter the long one would be? Autozone can't find it and the nearest nappa is like 20 miles. I can head there tomorrow if needed.

[Walterbus]

A Fram ph373 would work in place of the 1794 correct? It looks to be the same thread etc.

[PorchDog]

The fitment chart for the 373 filter shows to fit the 350, 366, 427, etc. All medium duty GM Gasoline engines...

That should work just fine.