Loading...
Engine timing chain guide bolts start at $6.95 at AutoBuffy, where you'll find 2 options from URO. These bolts secure the plastic or metal guides that keep the timing chain on its correct path around the crankshaft and camshaft sprockets. When they loosen, strip, or break, the guide shifts or collapses, allowing the chain to slap, skip teeth, or derail entirely — causing serious engine damage.
The main decisions are material grade, thread specification, and whether you're replacing a single failed bolt or doing a full timing chain service. Because these bolts are torqued into aluminum or cast-iron housings and subjected to constant heat cycling and oil exposure, using the correct thread pitch and grade matters more than it does for most fasteners. Always cross-reference your factory thread size and length before ordering.
| Option | Best for | What you get |
|---|---|---|
| OEM-specification replacement bolt | Restoring original clamping force and fitment on a stock engine | Exact thread pitch, length, head size, and grade matching factory specs — safest choice for aluminum timing covers |
| Grade 10.9 / high-strength aftermarket bolt | High-mileage engines or cases where the original bolt showed signs of stretch or fatigue | Higher tensile strength than OEM grade in many applications; suitable where factory spec allows an equivalent upgrade |
| Full hardware kit (bolts + washers) | Complete timing chain jobs where guides, tensioner, and chain are all being replaced at once | All required fasteners in one purchase; ensures consistent clamping and saves a separate parts order |
| Thread repair insert + bolt set | Stripped or cross-threaded bolt holes in the timing cover or block | Helicoil-style inserts restore the original thread diameter so a standard replacement bolt seats and torques correctly |
Accessing timing chain guide bolts requires draining the coolant and oil, removing the front accessories and timing cover, and in many cases precisely positioning the engine at top dead center before any fasteners are disturbed. Once the cover is off, old bolts are removed, threads are inspected and cleaned, and new bolts are installed in the sequence and to the specification listed in the factory service manual. Because incorrect torque or a skipped step can result in immediate engine damage on startup, this job is best handled by an experienced DIYer or a professional mechanic.