LLY - Cracked piston

juddski88

juddski88

Freedom Diesel
Jul 1, 2008
4,657
120
63
Chesterfield, Mass.
I recommend billet hold downs and new hardware much more often these days for lly + generations. I have stretched stock bolts, and stripped threads from the head and bent and snapped stock hold downs in a few LLYs. First was my own built truck, and it happened at the end of a truck pull on cylinder 7. Second was a twin turbo stock fuel lly and happened with spirited driving on cylinder 6. Third truck was a workstock vgt truck with 45% injectors and happened several times over a weekend of pulling on multiple cylinders. Fourth truck was my father's, just recently, stock injectors, 425hp tune for 150k miles, 268k miles on the hardware, stretched 4 bolts and bent 2 hold downs - cylinders 1 & 7. All of these trucks ran different tuning from different people and had pretty different power levels.

Just my observations...
 
JoshH

JoshH

Daggum farm truck
Staff member
Vendor/Sponsor
Feb 14, 2007
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Texas!!!
Bdsankey said:
I haven't looked in awhile, do they offer high strength studs? The hard part, to me, will be the DIN washers.
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I've never seen any washers with the injector hold down stud kits I've installed. The thing I would be concerned about is the tapered seat in the hold down for the bolt. The factory bolt somewhat centers itself in the hold down and has a good contact with the taper. The kits I've used have the same matching taper, but I don't know how easy it would be to find something to give the same taper off the shelf.
 
Bdsankey

Bdsankey

Vendor
Vendor/Sponsor
Feb 1, 2018
4,225
1,330
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Larsen, Wisconsin
JoshH said:
I've never seen any washers with the injector hold down stud kits I've installed. The thing I would be concerned about is the tapered seat in the hold down for the bolt. The factory bolt somewhat centers itself in the hold down and has a good contact with the taper. The kits I've used have the same matching taper, but I don't know how easy it would be to find something to give the same taper off the shelf.
Click to expand...

The hold downs a friend of mine made use a DIN 6319 spherical washer which can be had cheap (and I do have here). The hard part is getting good hardware. I've been looking at ARP 400-8018 but I don't think they have the yield strength I'm after.

The Official ARP Web Site | Kits

arp-bolts.com arp-bolts.com
 
juddski88

juddski88

Freedom Diesel
Jul 1, 2008
4,657
120
63
Chesterfield, Mass.
JoshH said:
I've never seen any washers with the injector hold down stud kits I've installed. The thing I would be concerned about is the tapered seat in the hold down for the bolt. The factory bolt somewhat centers itself in the hold down and has a good contact with the taper. The kits I've used have the same matching taper, but I don't know how easy it would be to find something to give the same taper off the shelf.
Click to expand...

McMaster had the tapered washers available, I have bags of them, the studs, and the nuts. I haven't had time to sit down a research them again. I threw the packing slip away years ago and my order history isn't saved that far back. I now get must of my custom hardware from Atlantic Fasteners, and haven't had time to cross this stuff to their catalog either. Sorry.
 
Bdsankey

Bdsankey

Vendor
Vendor/Sponsor
Feb 1, 2018
4,225
1,330
113
Larsen, Wisconsin
juddski88 said:
McMaster had the tapered washers available, I have bags of them, the studs, and the nuts. I haven't had time to sit down a research them again. I threw the packing slip away years ago and my order history isn't saved that far back. I now get must of my custom hardware from Atlantic Fasteners, and haven't had time to cross this stuff to their catalog either. Sorry.
Click to expand...

Interested in selling one full set?
 
NevadaLLY

NevadaLLY

Adam B
Feb 24, 2019
332
44
28
Reno, NV
E6CFFAD7-A05A-42DB-B3A7-D034D985BEC8.jpeg
E628B549-7DA8-4A25-BF98-56FE29DD37B4.jpeg
2011 hydroboost is in. Simple job. Mine showed evidence of leaking so this should be a big improvement.

goal today is to get the rotating assy complete to short block. Long block if I’m lucky.
 
NevadaLLY

NevadaLLY

Adam B
Feb 24, 2019
332
44
28
Reno, NV
Bdsankey said:
How awful was install? I’ve been wanting to run one of these for awhile since the OEM insulation likes to go up in smoke.
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Well since I could basically sit in the engine bay, it was a piece of cake. If you’re reaching around the turbo and down pipe, it’ll be tough to get to the 10mm bolts you need to take out to install. The plastic clips can be spun off by hand and re-installed the same. Also, mine was torn out by a pack rat years ago so and I was putting it off because of that 😂
 
Bdsankey

Bdsankey

Vendor
Vendor/Sponsor
Feb 1, 2018
4,225
1,330
113
Larsen, Wisconsin
NevadaLLY said:
Well since I could basically sit in the engine bay, it was a piece of cake. If you’re reaching around the turbo and down pipe, it’ll be tough to get to the 10mm bolts you need to take out to install. The plastic clips can be spun off by hand and re-installed the same. Also, mine was torn out by a pack rat years ago so and I was putting it off because of that 😂
Click to expand...

Id be doing it when my engine is out as well. Good to know it’s not bad! Definitely looks far better than the OEM unit
 
NevadaLLY

NevadaLLY

Adam B
Feb 24, 2019
332
44
28
Reno, NV
3E159B8B-F324-44D4-86C4-5B01366E785D.jpeg
somehow I broke an oil ring using my compressor - ARP tapered type. Not sure how or why or what I did wrong - all was lined up nicely. Anyone know where I can get or if I can get just an oil ring? +.020 over.
 
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