95' Junker Drag Truck
- Thread starter Big Blue24
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Big Blue24
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Update: Open Heart Surgery (Pump Swap)
I finally rounded up some spare time to work on my own truck this past weekend. I think of a pump swap as open heart surgery on this truck, a lot can go wrong but it can make a huge difference if things go right!
Nice empty hole with the pump removed:
887 pump on the bench, I wanted to run it but I couldn't get the 5k springs dialed in to where it wouldn't run away, so I guess this pump is headed to pump shop for max-flow and balancing work. This 887 pump was going to be my intermediate pump for testing while the 160 was out getting the cam swap but since the 160 is back, no sense playing with this one right now.
New pump all dressed up with ratty old shutdown solenoid and fuel fittings.
I finally rounded up some spare time to work on my own truck this past weekend. I think of a pump swap as open heart surgery on this truck, a lot can go wrong but it can make a huge difference if things go right!
Nice empty hole with the pump removed:
887 pump on the bench, I wanted to run it but I couldn't get the 5k springs dialed in to where it wouldn't run away, so I guess this pump is headed to pump shop for max-flow and balancing work. This 887 pump was going to be my intermediate pump for testing while the 160 was out getting the cam swap but since the 160 is back, no sense playing with this one right now.
New pump all dressed up with ratty old shutdown solenoid and fuel fittings.
CorneliusRox
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Man, Seth does a good job cleaning up old pumps!
Hdhorton
Too broke to go fast
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You got that right. That looks really good. I can't wait to get all the parts and get mine sent off
kubotaorange76
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on edge of seat
Big Blue24
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I finally got the truck fired up with the new pump from Seth @ Farrell Diesel, idle speed was PERFECT!!! Pump is smooth, throttle is nice and touchy/responsive!
Bad news, the head gasket is puking oil on the passenger side of the block between #4 & #5 cylinders. I was pretty good about re-torques this time around, I guess I might have to pay the piper and get the head cut flat and possibly upgrade the fasteners beyond standard ARP 2000's.
Bad news, the head gasket is puking oil on the passenger side of the block between #4 & #5 cylinders. I was pretty good about re-torques this time around, I guess I might have to pay the piper and get the head cut flat and possibly upgrade the fasteners beyond standard ARP 2000's.
CorneliusRox
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Aren't you running an ebay head gasket too? I bet if you use an OEM and get the head decked, you'd be good. Although, it seems like you can find 425's or H11's for around $200-300 on occasion around here.
kubotaorange76
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crackerman
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Quickie belt sander refinish, permatex copper spray. Cummins gasket.
Fixed.
Fixed.
Big Blue24
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Update: Hamilton Head
Due to a large oil leak from the headgasket area, I decided to remove the cylinder head on the Junker Drag Truck and install that new Hamilton Head. I'm going to install it as-delivered from Hamilton with zero additional porting, polishing, etc. The head is a quite a bit heavier that my stock head, I'd guess somewhere in the 15-20 lb range but I'm sure Hamilton can fill in the weight difference.
So here it is in all it's glory:
It's clear to see the added material on the top side of the intake runners, more room for extreme porting!!!
The mounting bolt locations for the rear hoisting bracket has been eliminated so I'll have to get a little creative on where to attach my cherry picker chain to lower the new head into place. Not a big issue, just something to be aware of and plan for.
The valves are bigger on the Hamilton Head vs. stock:
New Intake vs Old:
New Exhaust vs Old:
Hamilton Exhaust Port/Bowl vs. home-ported stocker:
Major difference on the intake port/bowl on Hamilton vs ported stocker:
The valve stem bosses had to be cut down on the Hamilton head to run the small LS-based valve stem seals.
Dual valve spring compressor tool came in handy and made the valve spring swap much faster.
Teardown of the leaking head gasket:
Looks like spray pattern is still in the opened up bowl at 30* timing, good news!!! Also, you can see where the gasket was blown at the oil feed passage on #3 pedestal/rocker area.
New Cummins .020" over head gasket installed.
Hamilton Head all dressed up and ready to install with valves, springs, etc. From this view, it's easy to see the thickened and reinforced fire deck on the Hamilton Head.
Due to a large oil leak from the headgasket area, I decided to remove the cylinder head on the Junker Drag Truck and install that new Hamilton Head. I'm going to install it as-delivered from Hamilton with zero additional porting, polishing, etc. The head is a quite a bit heavier that my stock head, I'd guess somewhere in the 15-20 lb range but I'm sure Hamilton can fill in the weight difference.
So here it is in all it's glory:
It's clear to see the added material on the top side of the intake runners, more room for extreme porting!!!
The mounting bolt locations for the rear hoisting bracket has been eliminated so I'll have to get a little creative on where to attach my cherry picker chain to lower the new head into place. Not a big issue, just something to be aware of and plan for.
The valves are bigger on the Hamilton Head vs. stock:
New Intake vs Old:
New Exhaust vs Old:
Hamilton Exhaust Port/Bowl vs. home-ported stocker:
Major difference on the intake port/bowl on Hamilton vs ported stocker:
The valve stem bosses had to be cut down on the Hamilton head to run the small LS-based valve stem seals.
Dual valve spring compressor tool came in handy and made the valve spring swap much faster.
Teardown of the leaking head gasket:
Looks like spray pattern is still in the opened up bowl at 30* timing, good news!!! Also, you can see where the gasket was blown at the oil feed passage on #3 pedestal/rocker area.
New Cummins .020" over head gasket installed.
Hamilton Head all dressed up and ready to install with valves, springs, etc. From this view, it's easy to see the thickened and reinforced fire deck on the Hamilton Head.
Last edited:
12vriviera
That Guy with that car
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Will, if you feel inside the shelf at the #6 side of the intake, there is a casting in there, big cylindrical chunk of steel.
I frilled into it and tapped it for a bolt to hook the bracket to.
Just used one bolt in the bracket and it held the entire engine and transmission..
FYI.
And it will be awesome!, you will not be disappointed.
I frilled into it and tapped it for a bolt to hook the bracket to.
Just used one bolt in the bracket and it held the entire engine and transmission..
FYI.
And it will be awesome!, you will not be disappointed.
YoungDiesel27
Never Enough Time
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Good work on tapping the for the bracket. I just screwed a hardware store fitting with a bolt and Eyelet into the water temp hole
Big Blue24
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Don't forget to post up your dyno guess for the Junker Drag Truck at the upcoming dyno event on May 2nd. The closest guess will get a free set of delivery valves.
http://www.competitiondiesel.com/forums/showthread.php?t=182141
http://www.competitiondiesel.com/forums/showthread.php?t=182141
Big Blue24
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Update: Extreme Push Rods
While the motor was opened up for the new Hamilton Head, I figured with the 185# seat pressure dual spring setup, semi-aggressive 188-220 cam, and oversized valves, it was probably wise to upgrade the pushrods from the previous used Motorsports Supply chome-moly stock diameter rods to a used set of Hamilton Extreme 12v pushrods. The exhaust rods are larger diameter to deal with the increased cylinder pressure on the exhaust side of the motor.
The extreme pushrods are quite a bit thicker in diameter.
While the motor was opened up for the new Hamilton Head, I figured with the 185# seat pressure dual spring setup, semi-aggressive 188-220 cam, and oversized valves, it was probably wise to upgrade the pushrods from the previous used Motorsports Supply chome-moly stock diameter rods to a used set of Hamilton Extreme 12v pushrods. The exhaust rods are larger diameter to deal with the increased cylinder pressure on the exhaust side of the motor.
The extreme pushrods are quite a bit thicker in diameter.
rockjeep73
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Does the piston have a dimple in it where the injector is spraying or is it an illusion?
Big Blue24
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The piston has soot build up and it actually raises up on those places where the fuel is hitting the bowl. I cleaned up a couple of the pistons before securing the head and they all look crisp like when they came off the lathe.
kubotaorange76
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Any results on that lift pump i heard about in another thread?
Big Blue24
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Nothing yet, the injection pump locked up before I could do any testing.
kubotaorange76
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That really sucks that happened! i was hoping you would hit the 900 mark.
What was your last dyno results and mods?
What was your last dyno results and mods?