Join Date: May 2007
Location: Peoria, AZ
Posts: 9,117
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Re: Second time for Secondchance
Quote:
Originally Posted by secondchance
Upon head removal, head gasket failure was confirmed. I couldn't make Sunday but according to Dempsey inboard head bolts didn't take much force to unbolt. So, it seems quite feasible that failure may have been due to improper torque when the short block was assembled at the machine shop. Another possibility raised was detonation in #5 and #2 cylinder.
Heads are being shaved and cleaned and we will be making sure that all liners are level and have correct projection above the deck.
Another concern I had was very low oil pressure after the rebuild/install last year. I had about 10 psi at idle when the coolant reached 200 degrees. Well, guess what showed up in the oil pan?! - crankshaft oil plug!
In a way, head gasket failure was a blessing in disguise - forced me to pull the motor and resolve not only blown head gasket but also low oil pressure concern.
For those planning on off-set grind mini stroker crankshaft, make sure to instruct the machine shop to install plugs after the heat treatment. Rich (Scrrem) had the same issue. |
Actually this is the Third time this happened. My 380 was the first 380 install and the first to crap the crank plug in 2012. I highly suggest welding the expansion style crank plugs in. Thats the only way I would recommend to move forward. My tale of woe is below. Now that the pan is removed make sure the bottom side of the pistons are not damaged as well from the plug beating around in there. GC
http://www.zr1.net/forum/showthread....ght=crank+plug
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GOLDCYLON - 91 ZR-1 #2014
GOLDCYLON - 90 ZR-1 #2794, 4L60e (Formerly Schrade's)
GOLDCYLON - 11 CTS-V
Arizona State Director
91 WHITE/BLACK #2014. 380 P&P&PCed,Ported Heads, Jeal Long tubes, Corsa Exhaust/FIKSE FM-5s /LED TLs, LED Headlights, Front Wilwood 6 piston narrowlite calipers and rear Wilwood caliper street shop mod,CNCed Coolant Pipes,TPI Cvr,Filter cover,Stainless Bolts, DRM/DOM PROM /ZFDOC mod build #102,DRLs,BMAD with stainless Debris Screen,Coplan Air Blaster, Pioneer APP Radio 4,Brey-Krause HB,Sub Bar,Fire extinguisher seat mount,DRM Coilovers,LEDs everywhere,Compass mirror (orange),V1 DIC hidden display, Homelink sun visor, Carbon Fiber top x3 and APSIS Carbon Fiber interior, APSIS CF Steering Wheel/NAPA Leather, Banski trailing arms, Guldstrand front suspension,urethane bushings from Prothane (total suspension) ZFDoc drive shaft safety loop, raptor shift light (orange),AO engineering louver front plate, Console seat cushion, 96CE seats with black custom Sheepskins, ss billet catch can,Viper remote entry/alarm,Cragar Rear Louvers,LED side louver lights, Dewitts Radiator with SPAL fans and a Woods 160 T-Stat
90 RED/BLACK #2794. 4L60e Automatic Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless Headers, Corsa Exhaust, SAN Secondaries and Haibeck PROM, Exotic Muscle Coil overs, LED Interior Lights, LED Tail Lights, LED Headlights, 94 Sport seats with black custom Sheepskins , Cragar rear louvers, GS Front calipers, Banski Trailing arms, APSIS Carbon Fiber steering wheel, Front and Rear Baer Eradispeeds, DRLs, Guldstrand front suspension,urethane bushings from Prothane (total suspension), Dewitt's Raditor with Dual SPAL fans and a Haibeck 170 T-Stat
11 RED/GREY CTS-V
Last edited by GOLDCYLON; 09-23-2015 at 03:40 PM.
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