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 –
| Engine | Part No. | Description | Specifications | REQ. | ||
|---|---|---|---|---|---|---|
| C7 | 2768134 | BOLT | 14 | |||
| C9 | 2632915 | BOLT-12 POINT | M16-2.00 X 180MM 12 POINT | 26 | ||
| 9X8268 | WASHER | 17.5 X 30 X 3.5 MM THK | 26 | |||
| C10 | 1750454 | HEAD BOLT | M16X2X160-MM | 26 | ||
| 2S5658 | WASHER HARD | 17 X 29 X 3MM THK | 26 | |||
| C11, C13 | 2421811 | BOLT HEX | M16 – 2.00 X 220MM 12.9 HX PL | 26 | ||
| 2104460 | HEX CAP SCREW | M10 – 1.50 X 130MM 10.9 PLAIN ST | 8 | |||
| 2S5658 | WASHER HARD | 17 X 29 X 3MM THK | 26 | |||
| C12 | 1750454 | HEAD BOLT | 17 X 29 X 3MM THK | 26 | ||
| 2S5658 | WASHER HARD | 17 X 29 X 3MM THK | 26 | |||
| C15, C16, C18 | 1241855 | BOLT-12 POINT HEAD | 3/4 – 16 X 7.638 – IN. | 16 | ||
| 5H1504 | WASHER HARD | 20 X 33.5 X 5 MM THK | 26 | |||
| 1241854 | BOLT-12 POINT HEAD | 3/4 – 16 X 8.5 – IN. | 10 | |||
| C27, C32 | 1241855 | BOLT-12 POINT HEAD | 3/4 – 16 X 7.638 – IN. | 32 | ||
| 5H1504 | WASHER HARD | 20 X 33.5 X 5 MM THK | 52 | |||
| 1241854 | BOLT-12 POINT HEAD | 3/4 – 16 X 8.5 – IN. | 20 | |||
| C30 | 2K2813 | BOLT | 3/4 – 16 X 10 – IN. | 40 | ||
| 5H1504 | WASHER HARD | 20 X 33.5 X 5 MM THK | 40 | |||
* 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
