Our Services
Comprehensive Heavy
Diesel Services
Eleven specialist services for heavy diesel and commercial vehicles: engine overhauls to 24/7 breakdown. All makes and models, with mobile diesel mechanics on call across the South West.
Diesel Engine Overhauls
A tired engine is lost income. Naturaliste Diesel Services has been rebuilding heavy diesel engines since 1986, from top-end refreshes to complete out-of-frame overhauls. We work on all makes and models and rebuild to spec, so your unit leaves with the reliability of a machine you can plan around.
Our team strips, measures and rebuilds diesel engines to manufacturer tolerances: blocks, pistons, bearings, seals, oil and cooling systems, the lot. Every overhaul is documented and backed by honest advice on what actually needs doing and what doesn't. Whether it's a single prime mover or a run of fleet engines, we schedule the work to keep your downtime as short as it can be.
- In-frame and out-of-frame rebuilds
- Bottom-end and short-motor rebuilds
- Pistons, liners and bearings
- Cooling and oil system rebuilds
- Rebuilt to manufacturer tolerances
- All makes and models
- Documented, warranty-backed work
- Scheduled to minimise downtime
Clutch Repairs & Replacement
Clutch and brake work is where this business started, back when it was GT Brake & Clutch Repairs in 1986. Decades on, it's still core to what we do. We diagnose, repair and replace heavy-vehicle clutches so your drivers get clean, predictable engagement and your trucks stay on the road.
From slipping and shudder to full replacements, we handle single and twin-plate heavy clutches, clutch hydraulics, release bearings and flywheel machining. We use quality components rated for the loads you actually carry, and we're straight with you about whether a repair or a full replacement is the smarter spend.
- Heavy-vehicle clutch replacement
- Single and twin-plate clutches
- Slip and shudder diagnosis
- Clutch hydraulics and linkages
- Release bearing replacement
- Flywheel machining
- Quality, load-rated components
- Honest repair-vs-replace advice
Brake Repairs & Servicing
Brakes are non-negotiable on heavy vehicles, and they're a trade we've held since 1986. Naturaliste Diesel Services overhauls and services truck and trailer brake systems so your fleet stops the way it should, every load, every time.
We service and repair drum, disc, air and hydraulic brake systems, slack adjusters, chambers and valves, plus wheel bearings and seals, and carry out brake testing. Work is carried out to standard and documented for your compliance records, whether it's a single repair or a full brake overhaul.
- Drum and disc brake overhauls
- Air brake system servicing
- Hydraulic brake system servicing
- Brake testing
- Slack adjusters, chambers and valves
- Wheel bearing and seal replacement
- Trailer and multi-axle brakes
- Compliance-ready documentation
Driveline, Differential & Gearbox Overhauls
When the driveline lets go, the whole job stops. Naturaliste Diesel Services overhauls differentials, gearboxes, tailshafts and driveline components for heavy commercial vehicles, rebuilding them to handle real working loads.
We strip and rebuild diffs, manual and auto gearboxes, and driveline assemblies right down to the bearings, gears, seals and universal joints, then set them up to spec. We diagnose noise, vibration and wear early so a small job doesn't become a roadside recovery, and we back every rebuild with straight advice on service intervals.
- Differential rebuilds and set-up
- Manual and auto gearbox overhauls
- Tailshaft and universal joint repairs
- Bearing, gear and seal replacement
- Noise and vibration diagnosis
- Heavy-truck and plant driveline
- Rebuilt to manufacturer spec
- Advice on service intervals
Exhaust System Repairs
A blown exhaust or a blocked aftertreatment system will pull a truck off the road fast. Naturaliste Diesel Services repairs, fabricates and refits heavy-vehicle exhaust systems so your units run clean and stay compliant.
We handle exhaust repairs and custom fabrication, mounting and flex-joint replacement, and DPF and aftertreatment diagnosis and repair. Work is done to suit the demands of commercial operation, with hard-wearing materials built to survive the corrugations.
- Exhaust repair and replacement
- Custom exhaust fabrication
- Flex-joint and mount replacement
- DPF and aftertreatment diagnosis and repair
- Compliance-focused repairs
- Heavy trucks and plant
- Built to survive the corrugations
Fleet Servicing & Maintenance
Consistent servicing is what keeps a fleet reliable, and reliability is what we sell. Naturaliste Diesel Services builds scheduled maintenance programs around your operation so problems get caught before they become breakdowns.
We service trucks, trailers and plant to planned intervals, covering fluids, filters, brakes, driveline and safety checks, and we keep clear records for each unit. Whether you run two vehicles or twenty, we tailor the schedule to your routes and workload so servicing works around your business, not against it.
- Planned, interval-based servicing
- Preventative maintenance programs
- Trucks, trailers and plant
- Per-unit service records
- Fluids, filters and safety checks
- Scheduled around your routes
- Small fleets to large fleets
- Fewer surprises, less downtime
DTMI Inspections & Main Roads Accreditations
Compliance isn't optional for commercial operators, and it's built into how we work. As a DTMI authorised inspection station with Main Roads accreditations, Naturaliste Diesel Services keeps your fleet road-legal and audit-ready.
We inspect heavy vehicles against the relevant standards, identify and rectify defects, and complete the documentation you need for licensing and compliance. It's the kind of by-the-book process that fleet managers, government contracts and mining operators expect, and exactly how we run.
- DTMI authorised inspection station
- Main Roads accreditations
- Heavy-vehicle compliance checks
- Defect identification and rectification
- Documentation for licensing
- Audit-ready records
- Built for fleet and government work
- Straight, by-the-book process
Field Service & On-Site Repairs
Not every job can come to the workshop. Naturaliste Diesel Services runs mobile diesel mechanics in fully equipped field-service units across the South West, so repairs and servicing happen where your vehicles are, without the cost and hassle of a tow.
Our field techs carry the tools and common parts to diagnose and fix mechanical, driveline and brake faults on-site, from Bunbury to Augusta. Whether it's a scheduled service at your depot or a repair at the roadside, we come to you and get the unit moving again.
- Fully equipped mobile service units
- On-site diagnosis and repair
- Depot, farm and roadside work
- Mechanical, driveline and brakes
- Bunbury to Augusta coverage
- Scheduled servicing on location
- No tow required
- Back moving, faster
Diagnostics & Fault-Finding
Modern diesel vehicles are as much electronics as they are iron. Naturaliste Diesel Services uses proper diagnostic equipment to read fault codes, trace intermittent problems and find the actual cause, so you're not paying to replace parts that were never the issue.
We diagnose engine, driveline, brake and electrical faults across all makes and models, interpreting live data and fault codes to pinpoint the problem. Then we tell you what's really going on in plain terms, and what it'll take to fix it, before any spanner comes out.
- Electronic fault-code scanning
- Live data interpretation
- Intermittent fault tracing
- Engine, driveline and brake faults
- Electrical system diagnosis
- All makes and models
- Root cause, not guesswork
- Plain-English explanations
Automotive Air Conditioning
A hot cab wears drivers down and slows the job. Naturaliste Diesel Services services, regasses and repairs automotive air conditioning across trucks, plant and commercial vehicles, so your operators stay cool and productive.
We diagnose and repair air conditioning faults, recharge refrigerant, replace compressors, condensers and hoses, and track down leaks before they empty the system again. Work is done properly and backed by honest advice on whether a repair or a replacement is the smarter spend.
- Air conditioning service and regas
- Leak detection and repair
- Compressor replacement
- Condenser and hose repairs
- Fault diagnosis and repair
- Trucks, plant and commercial vehicles
- All makes and models
- Honest repair-vs-replace advice
24/7 Breakdown Support
Breakdowns don't keep business hours, and neither do we. Naturaliste Diesel Services provides 24/7 breakdown support across the South West, so when a truck stops, there's one number to call and one crew that turns up.
Our on-call field units respond to breakdowns from Bunbury to Augusta, carrying the tools and common parts to get you moving on-site wherever possible. We understand what downtime costs, so we prioritise a fast, straight response: diagnose, fix what we can there and then, and get your unit back to work.
- Available 24 hours, 7 days a week
- South West response, Bunbury to Augusta
- On-call mobile field units
- On-site diagnosis and repair
- Common parts carried on board
- One number, one crew
- Downtime-focused response
- Your fixed point when it counts
Ready to Get Your Equipment Sorted?
Contact Naturaliste Diesel Services today for honest advice and a free, no-obligation quote.