Teardown and Rebuild

[Dieselfuture]

Or a Turbo seal

[crf450ish]

I've been reading this thread thoroughly from the start and have to commend everyone who's contributed their knowledge. I'm only on page 18...

 

quick question. Forgive me if it's been covered beyond page 18.....or I failed to catch it.

Whats the advantage of Marine pistons? 

Edited March 17, 2017 by crf450ish

[TFaoro]

18 hours ago, crf450ish said:

Did you wet sand those with 400 and use red scotch brite? I'd like to know. Thats how I polished my dirt bike frames back in the day. 

No, I sanded with an air grinder, then 400, 600, 800, 1000, 1500, and wet 2000. Then lots of polishing. 

 

8 hours ago, crf450ish said:

I've been reading this thread thoroughly from the start and have to commend everyone who's contributed their knowledge. I'm only on page 18...

 

quick question. Forgive me if it's been covered beyond page 18.....or I failed to catch it.

Whats the advantage of Marine pistons? 

Ceramic coated on the inside, upper and lower steel landing for both compression rings, compression rings are closer together. 

[TFaoro]

Swapped my PSG onto @trreed's pump and now I have a running truck   More tomorrow. 

[dripley]

Interesting!!

[Dieselfuture]

So it is possible

[jlbayes]

It has been possible. Only with a programmed psg. If you had a new blank one...be a little upset lol.

[Me78569]

I guess the main question was the keyway.   why are there various pn for the keyway?  I can't possibly see the keyway having enough offset to really notice.

[jlbayes]

It must be enough in some cases.

[CSM]

I am guessing, but I bet when they designed it offset keys were cheaper than keeping the tolerance stack from getting too carried away.  There is a lot of angular tolerances in that stack of spinny pumpy thingys. 

[trreed]

@jlbayes do you know if there is any identifying marks on the PSG's?  Such as if anyone could tell there was a SO pump with a HO PSG on it?

[Me78569]

Are you gonna post the images up Tyler?  

[jlbayes]

24 minutes ago, trreed said:

@jlbayes do you know if there is any identifying marks on the PSG's?  Such as if anyone could tell there was a SO pump with a HO PSG on it?

 

No idea.

[trreed]

That was the question floating around last night as Tyler did this swap.  My guess is that only a place with the 815 test stand would be able to tell the difference.

[Me78569]

agree they would never know and even if they did they would not be able to say you did it lol

[TFaoro]

3 hours ago, jlbayes said:

It has been possible. Only with a programmed psg. If you had a new blank one...be a little upset lol.

Internet said otherwise.... Haven't seen one done yet. 

That's what I don't get... You can change this thing out very easily, so why don't they sell a replacement? Calibration can't make that much of a difference, especially on a stock truck. The ECM will compensate for everything but timing, which a degree you would never notice a difference. 

3 hours ago, Me78569 said:

I guess the main question was the keyway.   why are there various pn for the keyway?  I can't possibly see the keyway having enough offset to really notice.

Still calling BS on the keyway. I looked at it and I can't tell there's any offset. 

1 hour ago, Me78569 said:

Are you gonna post the images up Tyler?  

Which ones would you like to see?

[Me78569]

your awesome gritty vp44 pictures lol

[TFaoro]

20 minutes ago, Me78569 said:

your awesome gritty vp44 pictures lol

so this is the sensor that reads how fast the VP is turning. Very similar to an ABS sensor. It's magnetic, so it catches the fine metal and chunks. 

 

The tag has the chunks I took out of mine, but I knocked the rag on the floor so I lost half of em. Trevor's had quite a bit of very very fine metal. 

[trreed]

So even though it still works, sounds like my pump was still eating itself. 

[TFaoro]

2 hours ago, trreed said:

So even though it still works, sounds like my pump was still eating itself. 

Stock in-tank lift pump with a programmer