Parts for your 2017 Holden Colorado-Head gasket

2017 Holden Colorado head gasket — what it does and when to sort it

Yes, a head gasket is fitted to the 2017 Holden Colorado. The RG-series Colorado with the 2.8‑litre Duramax turbo‑diesel (GM RPO LWN) uses a multi‑layer steel (MLS) head gasket between the cast‑iron block and the aluminium cylinder head. This is confirmed in manufacturer service literature and parts catalogues that specify head‑gasket replacement procedures, torque‑to‑yield head bolts, and gasket thickness selection for this engine.

• GM Service Information (SI) for RG Colorado 2.8L Diesel (LWN): Cylinder Head and Gasket replacement procedures
• Holden/ACDelco Genuine Parts catalogues listing a head gasket for RG Colorado 2.8L Diesel
• Chevrolet Colorado/GMC Canyon 2.8L Duramax (LWN) engine service content showing MLS head gasket usage

The head gasket on a 2017 Holden Colorado keeps three critical systems in check under the bonnet: it seals combustion pressure, it keeps coolant in its passages, and it keeps engine oil where it should be. On a high‑compression turbo‑diesel like the 2.8, that’s a tough gig, so the factory uses a durable MLS gasket to handle cylinder pressure and heat cycles without fretting or blow‑by.

It’s not a routine service item, but its life is closely tied to cooling‑system health and driving conditions. Regularly changing coolant to the correct spec, keeping the radiator and fan system in good nick, and never ignoring an overheat warning are the best ways to protect it. Towing, heavy loads, big ambient temps, or performance tunes can push combustion and coolant temps up, so watching gauges and easing off when things get hot will pay off long‑term.

When replacement is needed, it’s a precision job. The head comes off, surfaces are cleaned and measured for flatness and finish, and the correct‑thickness MLS gasket is selected. Always use new torque‑to‑yield head bolts (or approved studs) and follow the factory torque‑angle sequence to the letter. It’s smart to pressure‑test the cooling system, check the EGR cooler for leaks, inspect injectors and sealing washers, and verify there’s no combustion gas in the coolant before buttoning up. After reassembly, fresh oil and coolant, proper bleeding, and a thorough road test under load help confirm the fix.

Typical warning signs include unexplained coolant loss, hard cold starts, white exhaust vapour after warm‑up, overheating, pressurised hoses when cold, or milky oil. Catching any of these early can save the head from warping and keep repair costs down.

FAQs

Does the 2017 Holden Colorado have a head gasket?
It does. The 2.8‑litre Duramax (LWN) turbo‑diesel uses an MLS head gasket between the head and block, just like most modern four‑cylinder diesels.

How long should a head gasket last on a 2.8 Colorado?
Often the life of the engine if cooling‑system maintenance is on point. Overheating, poor coolant, or hard towing in hot conditions can shorten its life, so regular servicing and watching temps matter.

What does a head‑gasket job usually cost in AU/NZ?
Ballpark figures vary with parts and machine work, but many shops quote around AUD $2,000–$4,500 or NZD $2,500–$5,500, with 10–18 labour hours typical. A warped head or injector issues can add to that.