Did you know…..

All C series engines require that the used head bolts be discarded and replaced with new head bolts every time there is a repair.

Used TTY (Torque-To-Yield) head bolts will snap in the process of re-torqueing the cylinder head. If they do not snap, the already permanently stretched bolts will stretch even further and rapidly lose clamping load. The loss of clamping load could ultimately lead to head gasket failure.

The way Torque-To-Yield bolts work is simple; the bolts are longer and thinner when compared to early bolt designs.

When these bolts get torqued (tightened) “to yield” meaning to almost the breaking point, the bolts will stretch. This stretching (like a spring) provides a constant clamping force on the cylinder head.

When an engine operates, the cylinder head expands as it heats up and contracts when it cools down. The spring like clamping force of the TTY bolts allows for this expansion and contraction without losing the clamping pressure on the cylinder head, and thus maintaining the sealing integrity of the head gasket.

C-Series Head Bolts –

EnginePart No.DescriptionSpecificationsREQ.
C72768134BOLT14
C92632915BOLT-12 POINTM16-2.00 X 180MM 12 POINT26
9X8268WASHER17.5 X 30 X 3.5 MM THK26
C101750454HEAD BOLTM16X2X160-MM26
2S5658WASHER HARD17 X 29 X 3MM THK26
C11, C132421811BOLT HEXM16 – 2.00 X 220MM 12.9 HX PL26
2104460HEX CAP SCREWM10 – 1.50 X 130MM 10.9 PLAIN ST8
2S5658WASHER HARD17 X 29 X 3MM THK26
C121750454HEAD BOLT17 X 29 X 3MM THK26
2S5658WASHER HARD17 X 29 X 3MM THK26
C15, C16, C181241855BOLT-12 POINT HEAD3/4 – 16 X 7.638 – IN.16
5H1504WASHER HARD20 X 33.5 X 5 MM THK26
1241854BOLT-12 POINT HEAD3/4 – 16 X 8.5 – IN.10
C27, C321241855BOLT-12 POINT HEAD3/4 – 16 X 7.638 – IN.32
5H1504WASHER HARD20 X 33.5 X 5 MM THK52
1241854BOLT-12 POINT HEAD3/4 – 16 X 8.5 – IN.20
C302K2813BOLT3/4 – 16 X 10 – IN.40
5H1504WASHER HARD20 X 33.5 X 5 MM THK40

* Other part no. not included in the list are available. Please contact your sales representative if you have any questions.
Part Numbers are used for reference purposes only