Engine Repair
Engine repair covers the faults found after diagnosis, from leaking components and failed accessories to problems that affect how the engine runs. This page explains what to expect from a mobile approach and where its limits are.
- AvailabilityCalls and messages 24/7
- WhereRoadside, yard or jobsite
- CategoryHeavy-Duty Truck Repair
- On-site repairWhere feasible and safe
About engine repair.
Engine repair covers the faults found after diagnosis, from leaking components and failed accessories to problems that affect how the engine runs. This page explains what to expect from a mobile approach and where its limits are.
A mobile mechanic can look at the unit where it stands, whether that is the roadside, a yard or a jobsite. That can avoid a tow and shorten downtime when the fault is suited to on-site work.
Part of Heavy-Duty Truck Repair.
When you might need it.
Any of these is a good reason to call and describe what the unit is doing.
Oil, coolant or fuel leaks around the engine
Misfires, knocking or unusual vibration
Overheating or loss of oil pressure
Repeated faults after previous repairs
What the service involves.
Confirming the fault through diagnostics first
Replacing or repairing accessible components
Checking related systems affected by the failure
Advising when a shop-based repair is the safer route
Causes and good habits.
These are possibilities, not a diagnosis. The only way to know is to test the unit.
Possible causes
- Worn or failed accessories and gaskets
- Leaks from seals, lines or the cooling system
- Damage from running low on oil or coolant
Practical tips
- Do not keep driving with low oil pressure or overheating
- Log when leaks started and how fast levels drop
What to expect.
Major internal engine work is generally not suited to roadside or yard conditions. Fellows will discuss what is realistic before any work begins.
On-site repair depends on the fault, parts, vehicle condition, safety and service feasibility.
(437) 601-8551Before you call
- Exact location, and direction of travel on a highway
- Truck or trailer type, make and year if known
- What happened and what warnings you see
- Whether the unit is somewhere safe
- A number we can call back
From the first call to the fix.
Call or message
Tell us where the unit is.
Describe the fault
Symptoms, lights, noises, leaks.
Agree the plan
Feasibility and dispatch, discussed honestly.
Diagnose and repair
On site where it is possible and safe.
Services that often go together.
Engine Diagnostics & Troubleshooting
When a heavy-duty engine derates, stalls, loses power or throws fault codes, finding the actual cause matters more than clearing a light.
Coolant System Repair
Overheating can damage an engine quickly.
Fuel System Repair
Fuel faults show up as stalling, hard starting or weak power.
Oil & Filter Change
Regular oil and filter service is the simplest way to protect a diesel engine.
Frequently asked questions.
Can major engine repairs be done on site?
Many component-level repairs can. Heavy internal work usually needs a workshop, and we will tell you honestly if your truck falls into that category.
How do I request this service?
Call (437) 601-8551 or message us on WhatsApp with your location and the issue. For non-urgent work, use the contact form.
Can every repair be done on site?
No. It depends on the fault, parts, vehicle condition, safety and feasibility.
Stranded on the Road? Let's Talk.
Tell us where your truck or trailer is located and what happened. Contact Fellows to discuss mobile repair options and next steps.
(437) 601-8551Have ready: exact location, truck or trailer type, what happened or what warnings you see, whether the unit is somewhere safe, and a callback number. Timing, dispatch and on-site repair depend on location, availability, the fault, parts and safety.