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. To give you a quick reference of torque sequences, OnAllCylinders’ Lori Sams has created a series of infographics for different engine makes. 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. Most TTY cylinder head bolt specs will involve both an initial torque (in ft.-lbs. No, I couldn’t believe it either. In the specs under torque specifications listed separately are the following: 4G13/4G15 Cylinder head bolts 73Nm (in sequence) 4G92/93 Cylinder head bolts 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. Cylinder head bolts may be re-used provided they pass one of the following tests. The first factor is the bolt's diameter. Big-end bolts/nuts? I haven’t yet removed the head, but reading though the manual on refitting I became puzzled in regard to tightening the head bolts. It takes more force to tighten a 3/4-10 bolt than to tighten a 318-16 bolt because it is larger in diameter. The book refers to 4G13/4G15 engines and 4G92/93 engines. Screw each bolt by hand into oil rail. 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. or Nm), plus a specific degree of bolt head rotation, called torque plus angle tightening. Many cylinder heads require multiple torque sequences to achieve proper tension. 1 – DO NOT use any sort of thread lock compound. Always refer to the appropriate service information for proper tightening in stages. E-2 “Valves con’t” on page D-7) 5, 4 each, M8x1.25x50L; and ITEM 6, … Head bolt torque sequence, however, generally remains constant for a given engine. I have to say it’s a new one on me. 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. The bolt tightening force is an important factor for the mutual sealing of combustion chamber, lubricant and coolant channels, and the ambient air. Yep. Test with cylinder head removed. 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. 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. Yes, some folk did. Measure distance from cylinder block face to under bolt head “A” in ilustration: 97 mm or less. The second factor is the bolt's grade. Cylinder-head bolts are the connecting elements between engine block, cylinder-head gasket, and cylinder head. ... generally, 15-17 ft-lbs is in the range of a 3/8ths bolt. Several factors affect how much tension occurs when a given amount of tightening torque is applied. Bolt may be re-used. bolt (torque) at some point causes it to stretch (tension). Carefully enter head bolts in their original fitted location, DO NOT DROP. Today, we’ll look at cylinder head torque sequences for General Motors L8 and V8 engines. Regardless of how silly the extra step of angle tightening may seem to some people, there’s a … so be sure of ur bolt size, unless u source specs per the oem service manual.
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