You are watching: Gm 3400 intake manifold torque specs
Hey guys,I was looking at the gasket sets for the 3.4 v6 engine for my 2004 Impala and noticed for the intake manifold it mentioned replacing the bolts recommended.Has anyone heard of this? Has anyone done this? Is it really necessary?I"ve heard of replacing the head bolts but the intake bolts?I want to make sure before I do replace them. If it"s not really needed I won"t do it but if it is then I"ll do it. Not trying to be cheap, just not spend any more money than necessary, and if intake manifold bolt replacement really isn"t needed then I won"t do it.Thanks in advance!
Apply threadlock GM P/N 12345382 (Canadian P/N 10953489) to the threads and Tighten the upper intake manifold bolts and studs to 25 N·m (18 lb ft).No mention of replacement.
What about the lower intake? Those are the ones it looks like replacement is recommended based on what was showing on autozone. Sent from my iPhone using Tapatalk
Here what it says--Caution!Maximum gasket performance is achieved when using new fasteners, which contain a thread-locking patch. If the fasteners are not replaced, a thread locking chemical must be applied to the fastener threads. Failure to replace the fasteners or apply a thread-locking chemical MAY reduce gasket sealing capability.Caution!Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
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ImportantAll lower intake manifold bolts need to be cleaned, free of any foreign material, and reused only if new bolts are unavailable. Use GM P/N 12345382 (Canadian P/N 10953489) or equivalent and apply to the old intake manifold bolt threads. ImportantManufacturer recommends the center bolts be fully torqued before the diagonal bolts to assure proper seal ability. ImportantLower intake manifold bolts in location 6 and 7 should be torqued to specification using a crows foot type tool. Install the lower intake manifold bolts.Tighten Tighten the vertical lower intake manifold bolts (1, 2, 3, 4) in sequence to 7 N·m (62 lb in) on the first pass.Tighten the diagonal lower intake manifold bolts (5, 6, 7, 8) in sequence to 7 N·m (62 lb in) on the first pass.Tighten the vertical lower intake manifold bolts (1, 2, 3, 4) in sequence to 13 N·m (115 lb in) on the final pass.Tighten the diagonal lower intake manifold bolts (5, 6, 7, 8) in sequence to 25 N·m (18 lb ft) on the final pass.