I was putting on my exhaust manifold and i was slowly tightening one of the bolts with a torque wrench. The tension on the bolt was not very much. I'm guessing about fifteen to twenty pounds and it specifies for thirty pounds. At about 15 or 20 pounds i heard a slight crack. I wasn't sure where it came from or if it was just something falling. I took the bolt out and it was fine, head and manifold looked fine as well. So i installed the manifold again and the tightening sequence went just fine without any weird sounds. I was just wondering if there was any way the cylinder head could be cracked?
The exhaust manifold is the weak link here and would usually crack before the head. You'd probably even break a manifold bolt before you'd crack a head. Bolts that have been heated will stretch when they are torqued and don't always give true torque readings. Best to buy new bolts for the manifold when reworking it.
90 degree riser from the Exhaust Manifold from a 120 Mercrusier Engine, 90 degree riser from the Exhaust Manifold from a 140 Mercrusier Engine, 98 MERCURY MOUNTAINEER Exhaust Manifold 8-302 (5.0L), from 2/98 (cast), R. (EG, 98 MERCURY MOUNTAINEER Exhaust Manifold 8-302 (5.0L), from 2/98 (cast), L., Ford 302 exhaust manifold - from 1968 Cougar, E34 BMW 530 540 Y pipes from manifolds exhaust down pipe, Original cast iron left exhaust manifold 3733878 from '57(?) Chevrolet 283, MGB OEM Exhaust Manifold - from a 1971, 1971 FORD MUSTANG EXHAUST MANIFOLD FROM 351 CLEVELAND 4V LEFT SIDE , 1995 3000GT OEM COMPLETE EXHAUST SYSTEM FROM MANIFOLDS BACK TO THE EXHAUST TIPS, 99 01 FORD MUSTANG COBRA EGR TUBE FROM INTAKE TO EXHAUST MANIFOLD, TRIUMPH TR7 -- EXHAUST MANIFOLD FROM A 1981 FUEL INJECTION TR7 -- VERY RARE! , 2.5 GM S10 Exhaust Manifold from '89, NICE, Yamaha xl xlt gp 1200 powervalve exhaust manifold and hardware removed from 1999, 03 04 05 06 Nissan 350Z Left Side Exhaust Manifold From 4/03, 03 04 05 06 Nissan 350Z Right Side Exhaust Manifold From 4/03, 00 Nissan Frontier Exhaust Manifold 4 CYL Federal Emissions From 9/99, 97 Kia Sephia Exhaust Manifold DOHC 1.8L From 10/96, 03 04 05 06 NISSAN 350Z L. EXHAUST MANIFOLD FROM 4/03, 03 04 05 06 NISSAN 350Z R. EXHAUST MANIFOLD FROM 4/03, 03 MAZDA MPV L. EXHAUST MANIFOLD FROM VIN 334927 FR, 03 MAZDA MPV R. EXHAUST MANIFOLD FROM VIN 334927 RR, 96 97 NISSAN ALTIMA EXHAUST MANIFOLD FROM 2/96, 99 00 PATHFINDER L. EXHAUST MANIFOLD FROM 12/98, 99 00 PATHFINDER R. EXHAUST MANIFOLD FROM 12/98, 99 00 PATHFINDER R. EXHAUST MANIFOLD FROM 12/98, 99 00 PATHFINDER L. EXHAUST MANIFOLD FROM 12/98, 96 97 NISSAN ALTIMA EXHAUST MANIFOLD FROM 2/96, 96 97 NISSAN ALTIMA EXHAUST MANIFOLD FROM 2/96, 03 NISSAN ALTIMA EXHAUST MANIFOLD 2.5L 4 CYL FROM 2/03, Ecotec stock EXHAUST manifold(from a grand am but will bolt up to any GM ecotec), 03 04 05 06 NISSAN 350Z R. EXHAUST MANIFOLD FROM 4/03, 93 EXPO EXHAUST MANIFOLD 2.4L FED FROM 1/1/93, 96 97 NISSAN ALTIMA EXHAUST MANIFOLD FROM 2/96, 03 04 05 06 NISSAN 350Z L. EXHAUST MANIFOLD FROM 4/03, 03 04 05 06 NISSAN 350Z R. EXHAUST MANIFOLD FROM 4/03, 03 04 05 06 NISSAN 350Z R. EXHAUST MANIFOLD FROM 4/03, 03 04 05 06 NISSAN 350Z L. EXHAUST MANIFOLD FROM 4/03, 03 04 05 06 NISSAN 350Z L. EXHAUST MANIFOLD FROM 4/03, NEW 49 50 51 Ford Exhaust Pipe From Manifold 1949 1950 1951, _1993-to-1996__SL_C_E_S_CLASS__Egr Pipe Line__Exhaust__Miss-MERCEDES__93-to-96__, 93 EXPO EXHAUST MANIFOLD 2.4L FED FROM 1/1/93, 97 SEPHIA EXHAUST MANIFOLD DOHC 1.8L FROM 10/96, 97 98 99 BMW 318I EXHAUST MANIFOLD FROM 1/97, 96 97 NISSAN ALTIMA EXHAUST MANIFOLD FROM 2/96, 01 02 VILLAGER L. EXHAUST MANIFOLD FR FROM 3/2/01, Seadoo Exhaust Manifold from 96 97 XP GSX 787 290979481, 99 00 PATHFINDER R. EXHAUST MANIFOLD FROM 12/98, 99 00 PATHFINDER R. EXHAUST MANIFOLD FROM 12/98, Yamaha Exhaust Manifold 6R7 from 92 WAVE Runner 650,
