Dsl_Dog_Treat
I lost my face to the jaws of a poodle
Well I had a break in shop action Sunday and decided to get the engine torn down and discovered that #7 piston is totally *****'ed due to the wrist pin overheating.
Removing the rod from the piston, as shown in the pics, the rod, wrist pin and piston crowns haver all been subjected to excessive heat.
Fearing my hunch was becoming more evident now, I put the piston cooling jet alignment tools on and confirmed my hunch.
As shown in the last pic, the alignment dowel is off to the side and putting pressure on the opening thus being was out of alignment.
#8 piston also had a scorched crown as well and cooling jet alignment was off as well.
The cooling jets on this 6.9 are the bolt on ones and probably on a stock biuld, this "may" be get ya by but seeing the EGT's that we do, I wouldn't chance it.
But shaving .060" off the tops of a Mahle hardened anodized piston isn't going to provide a long engine life when running high temps in these engines.
Sooooo, there's your dog catcher TSB engine building tip for the day.
I've been able to get ahold of Ken to get the final build specs, since Ken did the build, and round up the necessaries, 2 new pistons shaved, balanced and ceramic coated all to get it back to breathing fire.
Now to get some manifolds in the works to mount a few Holsets on top of them.
Removing the rod from the piston, as shown in the pics, the rod, wrist pin and piston crowns haver all been subjected to excessive heat.
Fearing my hunch was becoming more evident now, I put the piston cooling jet alignment tools on and confirmed my hunch.
As shown in the last pic, the alignment dowel is off to the side and putting pressure on the opening thus being was out of alignment.
#8 piston also had a scorched crown as well and cooling jet alignment was off as well.
The cooling jets on this 6.9 are the bolt on ones and probably on a stock biuld, this "may" be get ya by but seeing the EGT's that we do, I wouldn't chance it.
But shaving .060" off the tops of a Mahle hardened anodized piston isn't going to provide a long engine life when running high temps in these engines.
Sooooo, there's your dog catcher TSB engine building tip for the day.
I've been able to get ahold of Ken to get the final build specs, since Ken did the build, and round up the necessaries, 2 new pistons shaved, balanced and ceramic coated all to get it back to breathing fire.
Now to get some manifolds in the works to mount a few Holsets on top of them.
Attachments
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Passenger side block.jpg590.4 KB · Views: 117
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Crank passenger side.jpg690.8 KB · Views: 100
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Crankshaft.jpg372 KB · Views: 91
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#7 outboard side.jpg468.8 KB · Views: 98
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# 7 inboard side.jpg263.9 KB · Views: 93
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# 7 underneath.jpg534.9 KB · Views: 92
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#7 rod & wrist pin.jpg326.1 KB · Views: 110
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Cooling jet alignment plate.jpg327.8 KB · Views: 124
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