whats up my duramax family ive got a 07 silverado 3500 lbz, so trans blew and i got it rebuilt at a shop, shortly after engine took a dump had coolant going into the oil tons of blowby so when i tore it down i also notice the inner crank pin was sheared so i got a new long block cleaned everything up oil pump, oil cooler etc.. engine is stock rebuild other than 30 over injectors and a rebuilt turbo with a 9 blade turbine wheel when i got it started finally at idle in park there is a shake every second when accelerating in park you can still feel the vibration and it doesnt change its the same you can feel in the seat and shakes the mirrors but when in gear its super smooth and drives really smooth truck is not tuned by the way
WEIRD SHAKES AT IDLE???
- Thread starter eric7amaya
- Start date
Welcome
Your issue is going to be a hard one to diagnose over the Internet. There are many things that can cause vibration
Injectors, pressure regulator, cam/crank sensors, wiring/connectors, balancer, crank, pistons, compression. Maybe even flex plate and or converter.
Can you video it and post a YouTube link here?
Your issue is going to be a hard one to diagnose over the Internet. There are many things that can cause vibration
Injectors, pressure regulator, cam/crank sensors, wiring/connectors, balancer, crank, pistons, compression. Maybe even flex plate and or converter.
Can you video it and post a YouTube link here?
ill get a video tomorrow of the turbo also kind of blew up or something failed internally, at first before with the old engine it ran good and a previous mechanic had installed a 10 blade years ago when i rebuilt the turbo the first time i ordered a 9 blade turbine wheel from ebay i put the turbo together i skipped the tooth on the plunger that grabs onto the gear that moves the unision ring so i got code p2563 p003a i then took the turbo back out and fixed it and also installed a turbo depot 9 blade kit with a 9 blade turbine wheel and new compressor wheel it drove good for a couple miles then stopped spooling and started making a bad whine almost like a power steering whine, im going to order a rds 9 blade or a stainless diesel 9 blade
Might want to research those 9 blade turbos more. Not known for reliability
Some discussions about then in this thread
www.duramaxdiesels.com
Some discussions about then in this thread
Injector Limit for Cast Oval Bowl Pistons???
Also posted this in the LBZ forum, but figured I throw it in here too since this is a build forum. Picked up a stock LB7 short block recently for my LBZ project truck. Intend to build this utilizing a forged SOCAL crank and forged carillo rods, but want to use cast piston to get some more...
www.duramaxdiesels.com
Personally I would skip ANYTHING 9 blade. They are unproven turbines that have an elevated failure rate. A 9 blade turbine, while it does flow more, they are lazier/make less average HP & TQ across the RPM band when compared to a 10 blade turbine.
10 blades have been around for ages, super proven, take a pounding, and are readily available.
As for your shake, start with the basics:
1) Is the harmonic balancer wobbling while it's running or is it "true" to the crank's axis?
2) If you pull the oil fill tube while it's running, is there a ton of gas/smoke coming from the crankcase or is there almost nothing?
3) What do your balance rates and main fuel rate look like?
4) Are there any weird sounds? IE any squeaks/creaks/pops etc or does the engine (other than the miss itself) sound smooth?
10 blades have been around for ages, super proven, take a pounding, and are readily available.
As for your shake, start with the basics:
1) Is the harmonic balancer wobbling while it's running or is it "true" to the crank's axis?
2) If you pull the oil fill tube while it's running, is there a ton of gas/smoke coming from the crankcase or is there almost nothing?
3) What do your balance rates and main fuel rate look like?
4) Are there any weird sounds? IE any squeaks/creaks/pops etc or does the engine (other than the miss itself) sound smooth?
Last edited:
