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Well, actually there were two very small cracks ( magna flux). Shop that did the work is very reputable - does 12V heads weekly. I talked it over with him - his perspective was it was better than the last 50 heads he had seen, he said if it was him he would use it. PUMP REPORT: Update just...

Yes I'm aware of the Ca issue - 2x4's, air, trees and yes the 32oz soda...... are all list as official health hazards and thus require gov control! Anyone have experience with Reno shops?

In Sacramento , Ca.

Called the local Bosch authorized pump shop. Seems a very decent shop. I wanted them to check balance, check ask seating, increase fuel adjusting Issue is they will only set to spec due to (of course) gov regulations. I was hoping to install 3k ask before and have them increase fuel output...

Ok different pipe with a levermof 38" and about why I could lift on the end of it popped it. I'd say about a 110 _ 120 lb load is my max lift and I was about there = 330 - 360 ft-lbs ( now for the history only record I have of the fuel system being worked on was at the dodge dealer in about...

Update: HEAD machining done: valves seats machined new valve guides, and .007" milled off the deck (warped). Decided to pull injection pump to have it bench tested For balance BUT 250 ft-lbs with a torque wrench didn't phase it and then a breaker bar with pipe extension (3 ft lever arm) and...

Thx - I found a good shop to grind valves at least recommended by 2 independent people - Del' s machine in Sacramento. They clean, magnaflux, grind reassemble, and do Cummins 12V heads daily. I think I'm inclined to go with the 3 angle grind. Is there any downside to this.? I wonder why it...

It is also interesting that the two highest leak rates cylinders correlate to the intake valves with the greatest lash. I coppied the measurement results from the link above. It would seem the valve lash is greater because something is preventing full seating (bent valve or burned valve?) The...

Thanks for the tips. Will look up the water test. Yes the Cummins gasket kits are like 329$. I'll need to do the trade cost for the two options. 110k miles on the truck - which is why I am a bit surprised of the valve leakage, but maybe excessive heat can cause this - the prior owner didn't...

Any interest in this subject? I did pull the head , cylinder croosshatch looks really good no evidence of scoring so I am hoping my issue are in fact leaky valves. I did not see any evidence of a valve smacking a piston. Waiting for torq valve spring compressor and then will remove valves...

Following on to a long path of getting my 12V to run great again I did a leak down RATE TEST on my 12 valve because it hasn't been running up to par and this was the next step after going through the fuel system. Results are below - this is the average of 3 meaurements (really more 3 repeatable...

Ok - heres the SERPENTINE BELT DELETE: https://www.youtube.com/edit?o=U&video_id=81-HswI_R1A Well i did check out the FSS and as you can see the boot was a little bit deteriorated. Cleaned it all up - still shiny no real wear, applied 60 % moly grease to it - will get a new boot. I did...

I'll do the serpentine belt and startup. The good part is the signituer is there wheather it is cold or hot, and it likely will take at least 5 minutes to even begin to get warm - though will watch he temp - really only need about 3 minutes. I do like that idea to eliminate the pesky fan noise...

Well - no cigar today. The shimmed injector to 260Bar from 220 really didn't make much difference. Video below shows going up the biggest mole hill around here - trying to push on the pedel w/o gaining to much speed. Really no threat of that...

Pop test results: But first - fuel pressure is 24 at idle speed and drops to about 22 at 2000 rpm unlaoded. Under load i it is about 18psi. Pop test: i went to Valley Fuel Injection and Turbo in Woodland, CA (Valley Fuel Injection & Turbo, Inc. - Home) - who is the local authorized Bosch...

Yes - the signiture is the same at first start-up stone cold or at maximum temperature. Cat converter and muffler are stock, and i dont think ever tampered with.

Update On GAmes advice: Checked all valve pushrods - when relaxed all turn by hand very easy - no variable resistance at all. Checked lift of each valve with dial indicator - granted this wasn't an ideal mag base inditcator and matching angle of valve is "close" not perfect which will make an...

Adjusted valves all back to .009 and .018/.019 on exhaust. Then checked all cylinders by cracking injector lines, all dropped sharply and grossly apparent. So think this is a good sign. I did a test drive, perhaps my imagination but appeared not so apparent of the "thump" - are valve...

Ok valve Clearance Results: Cylinder / Int / Exh #1 / .008 / .018 #2 / .008 / .017 #3 / .009 / .018 #4 / .0115 / .019 #5 / .011 / .018 #6 / .008 / .0185 Valves: So does this point strongly that valves are ok, i would think it means no bent pushrods? If i remember right I set the...

My suspicions are alligned with this. There was a time a while back when my exhaust brake popped on at higher than anticipated rpms (long story there) and i always wondered if i hit valve float. Alledgedly there the pressure on the valve is set to prevent this by design but i didn't set it up...