If you have a clearance issue, such as a brake booster or master cylinder in the way, then head bolt might be necessary so the heads are easier to remove. In the specs under torque specifications listed separately are the following: 4G13/4G15 Cylinder head bolts 73Nm (in sequence) 4G92/93 Cylinder head bolts E-2 “Valves con’t” on page D-7) 5, 4 each, M8x1.25x50L; and ITEM 6, … The first factor is the bolt's diameter. No, I couldn’t believe it either. bolt (torque) at some point causes it to stretch (tension). or Nm), plus a specific degree of bolt head rotation, called torque plus angle tightening. Several factors affect how much tension occurs when a given amount of tightening torque is applied. Be sure to follow the correct sequence as well when torquing.I am unsure of the exact amount of bolts on that cylinder head, but the same idea applies, where a number represents a bolt. Most TTY cylinder head bolt specs will involve both an initial torque (in ft.-lbs. Big-end bolts/nuts? It takes more force to tighten a 3/4-10 bolt than to tighten a 318-16 bolt because it is larger in diameter. so be sure of ur bolt size, unless u source specs per the oem service manual. I haven’t yet removed the head, but reading though the manual on refitting I became puzzled in regard to tightening the head bolts. Cylinder head bolts may be re-used provided they pass one of the following tests. Carefully enter head bolts in their original fitted location, DO NOT DROP. Screw each bolt by hand into oil rail. Yep. Regardless of how silly the extra step of angle tightening may seem to some people, there’s a … When using almost any engine cylinder head stud/nut combination – be it standard or an up-graded after-market type – there are certain points that must be remembered. Today, we’ll look at cylinder head torque sequences for General Motors L8 and V8 engines. To give you a quick reference of torque sequences, OnAllCylinders’ Lori Sams has created a series of infographics for different engine makes. Bolt may be re-used. ENGINE REASSEMBLY Install New Valve Stem Seals D. Install and hand tighten seven (7) cylinder head mounting bolts (ITEM 4, 1 each, M8x1.25x60L; ITEM (See Fig. The tightening sequence on a cylinder head is a critical part of ensuring your cylinder head is tightened in a way that evenly distributes the tension and pressure across the cylinder head correctly. ... generally, 15-17 ft-lbs is in the range of a 3/8ths bolt. On applications with more than one fastener, such as wheel nuts or cylinder head bolts, the fasteners should be tightened to specification by alternating between the fasteners to ensure the parts are not distorted and that the fasteners are torqued evenly. The second factor is the bolt's grade. Test with cylinder head removed. Cylinder-head bolts are the connecting elements between engine block, cylinder-head gasket, and cylinder head. The bolt tightening force is an important factor for the mutual sealing of combustion chamber, lubricant and coolant channels, and the ambient air. Always refer to the appropriate service information for proper tightening in stages. Yes, some folk did. Many cylinder heads require multiple torque sequences to achieve proper tension. The book refers to 4G13/4G15 engines and 4G92/93 engines. Measure distance from cylinder block face to under bolt head “A” in ilustration: 97 mm or less. 1 – DO NOT use any sort of thread lock compound. Head bolt torque sequence, however, generally remains constant for a given engine. I have to say it’s a new one on me. If you take a moment and Google your particular year and model of engine, you will find an illustration of the cylinder head bolt tightening sequence and the torque specifications to use.
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