300+ rebuild

[mowerman]

6 minutes ago, Joey Mack said:

Im pickin up what you put down.. That sucks. The last p.o.s. job i did was pulling a mack tranny out of a granite dump truck,outside on a small hill, using plywood on the dirt to roll the jack.  That job sucked..  

ive done the same thing but it was level ground,,,,lotsa rocks,,,plywood and a pallet jack and of coarse alone lol.bob

[fjh]

Yup  plywood on a side hill done that too! Improvise! 🤔if you don’t do it it ain’t getting done!

[davehummell]

I have changed some clutches out in the yard with a sheet of plywood it adds to the job when the jack doesn't roll worth a darn

[mrsmackpaul]

On 11/25/2025 at 6:59 AM, Freightrain said:

 

I'm going to drop the radiator off and look to have it recored.  It doesn't leak, now, but with the added power/heat I want it to be good for awhile longer.

 

I reckon it's cheap insurance on a good motor 

I got the R model done, it was crazy expensive, I think all Australian Macks of that era came with the biggest radiator you could get

 

I can't remember the exact price, but it was over $5000 Australian 

Back then, with the exchange rate it was about $3600 US

You probably felt the earth tremor when my jaw hit the ground

But compared to the cost of a motor it is cheap

 

Paul

[Freightrain]

I am not holding my breath until I get a price.  It won't surprise me if it is crazy.  But this is a very small radiator compared to an R model.

The original has worked flawless for 25 yrs.  Even on the biggest, longest grade I run it just gets to 200* and just holds it.  It is a 9* grade in Pennsylvania.

[Geoff Weeks]

6 hours ago, mrsmackpaul said:

I reckon it's cheap insurance on a good motor 

I got the R model done, it was crazy expensive, I think all Australian Macks of that era came with the biggest radiator you could get

 

I can't remember the exact price, but it was over $5000 Australian 

Back then, with the exchange rate it was about $3600 US

You probably felt the earth tremor when my jaw hit the ground

But compared to the cost of a motor it is cheap

 

Paul

Late 2000 teens, I had a recore on my 9670, and it cost $2150.00so not at all surprised by your figure. It wasn't the biggest radiator IHC put in that truck either. I'm sure the biggest would be close to what you paid.

add $400 to that price for the used radiator I bought to start the project.

[mowerman]

Yeah I would guess around that also but I understand they are still available good luck Larry 

[Freightrain]

Well, weekend update.

Dropped off radiator Friday.  They can handle it. $1200.  Well,at least it isn't $2000....  I told them to do it.  I was surprised how flattened out the fins were around the fan area on the back.  I'm surprised it cooled as well as it did.

I picked up the puller and started on it this evening.  Got #1 out.  Found out what the .020 stamped on deck.  Block bored oversize.  I need to make sure I can get oversize sleeves.  These were Mack sleeves.

You can just see the .020 on the deck by the sleeve.  The bore is 4.875, which is stock.  Apparently the dealer must have rebuilt this at some time and bored the block.  I knew it has been apart due to red silicone on gasket surfaces.

I will contact Mack and see if these are still available or if PAI has them before going any farther.  May have a large paperweight on my hands??  Might be in framing the 237 and bolting on 300 parts.

 

Time marches on ......

[Joey Mack]

The P20 on the liner says the same thing. .020" 

[Freightrain]

Hopefully they are still easily gotten.

[mrsmackpaul]

You can buy 20 thou over sleeves in Australia off the shelf 

So I reckon it won't be a drama in the U.S. as ours probably come from the same supplier 

If the link works in Yanky land you'll see STD, 6, 12 and 20 thou sleeves 

Cylinder Sleeve For Mack Engine E-6 2VH/4VH - MaxiTrucks https://share.google/H24bIClcGFfCC1rKZ

 

Paul

[Freightrain]

Thanks for that Paul.

I also just pulled the front Jake housing off the 237 and found out the valve lash caps are the same for the 300 valve stems(.500), so I don't have to chase those down.

[fjh]

Don’t assume you have 6 p20 liners! You need to pull them all !  In my opinion!

[mowerman]

Man that’s a fantastic price on the recore wow 

[Freightrain]

9 hours ago, fjh said:

Don’t assume you have 6 p20 liners! You need to pull them all !  In my opinion!

I will once I confirm I can get them.  The deck is stamped at every liner that it is .020.

[Freightrain]

Good news.  Local Mack says full kits are available in .020 liners.

Pt number 215SB196CP2

$3355 cash over the counter.  

Now I will pull the last 5 liners and confirm before ordering.

[mowerman]

thats excellent larry thanks for the update

[Freightrain]

All 6 out.

Picked up the right oil pan from motor shop as they hot tanked it for me.  I traded the big 54 qt model for this.  Good to have friends in good places.

I also picked up the radiator but it's dark and cold so I will get pics tomorrow.  I want to slip it in the collar to make sure everything is just as it was and will fit when I go to assemble this pile of parts come spring.  I can't see it being an issue as the upper and lower tanks and side brackets all have to fit together and if the core was not sized right then they would not have been able to solder it together.

Will be stopping at Mack dealer next week to order the kit.

Piece by piece.....

[Freightrain]

Looks brand new!  Can't wait to bolt it back in.

 

 

[mowerman]

Wow, nice neat work and yes, it does look new. Thanks for that Larry.

[mrsmackpaul]

I assume the oil pickup is different on the bigger sump ?

Might be worth looking into

 

Paul 

[Freightrain]

21 hours ago, mrsmackpaul said:

I assume the oil pickup is different on the bigger sump ?

Might be worth looking into

 

Paul 

The sump pickup is the same.  Unlike a car engine where a deep pan usually takes a longer pickup these engines use the same.  It just has more volume to pull from.

[Freightrain]

Placed my order for a kit.  Hope to pick it up in a few days.  It is coming out of Columbus, Ohio so it should only be a day or so.

[Freightrain]

Santa came early.....

One day delivery.  Not bad.  Didn't expect it until maybe tomorrow but got a call this afternoon and ran down and got it.

 

[seyser]

Very nice!!!