What SAE fasteners do our trucks use?
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Dusty1
The head bolt is a 7/16th UNC hence the head is 5/8 socket size.
The LR engine has progressively gone metric as it was developed from its Buick roots.
So goes the basic block and head which has stayed UNC, but LR added on's are metric.
As an example the main bearing cap bolts are UNC, but the side girdle bolts introduced on 4.00/4.6 derivatives are 8x1,25 metric.
Equally the heads are largely UNC but valve cover hold down screws are metric.
The easy to catch you out is the timing cover!
Major through bolts into the block are 5/16th UNC, pan/bolts studs are 8x1.25 metric and the water pump is 8mmx125 with a mini hex head calling for a 10mm socket.
No confundo! Cheers
T/V
The head bolt is a 7/16th UNC hence the head is 5/8 socket size.
The LR engine has progressively gone metric as it was developed from its Buick roots.
So goes the basic block and head which has stayed UNC, but LR added on's are metric.
As an example the main bearing cap bolts are UNC, but the side girdle bolts introduced on 4.00/4.6 derivatives are 8x1,25 metric.
Equally the heads are largely UNC but valve cover hold down screws are metric.
The easy to catch you out is the timing cover!
Major through bolts into the block are 5/16th UNC, pan/bolts studs are 8x1.25 metric and the water pump is 8mmx125 with a mini hex head calling for a 10mm socket.
No confundo! Cheers
T/V
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