We carry out many overhauls on engines in various sectors, both in situ and here at our workshop in Colchester.
And we’re often asked whether one of the options is better than the other.
The reality is that it depends.
For example, for one marine operator, we carried out a top-end overhaul onboard a windfarm vessel, which saved them downtime and reduced the overall cost.
However, when it came to another of their engines also requiring a top-end overhaul, they wanted the overhaul carried out in our workshop.
During the inspection phase of the latter, we found that a cylinder head gasket was leaking. This could cause coolant to enter the combustion chamber where it would affect the engine performance.
Also, if the leak is severe enough, it could lead to hydraulicing of the engine which usually results in catastrophic engine failure.
It could also mix with the oil, and in turn cause bearing failure due to loss of lubrication.
We also found that the sump gaskets had failed.
These will be rectified during the overhaul, and we only discovered them as a result of removing the engine and being able to do a comprehensive inspection.
However, it’s not always called for, and where time and cost is involved, an in-situ overhaul may be the best option for you.
There are benefits to both and considerations that need to be taken into account when choosing your overhaul location:
| In Situ | In our workshop | ||
| Pros | Cons | Pros | Cons |
| Reduced cost | Limited space | The ability for more detailed inspection – | Increased turnaround time |
| Faster turnaround | Will not see hidden issues with the lower half – sump gaskets etc | Sump inspection for example | Slightly more costly |
| Fewer engine logistics required | Specialist lifting equipment required | Further issues are easier to detect | Increased engine logistics |
| Some tasks cannot be completed in situ | Other repairs can be carried out as required | ||
| Onsite cleaning facilities | |||
| Onsite lifting equipment | |||
In the case of the engine sent to our workshop, it was most definitely the right call, as it enabled the changing of failed gaskets and will prevent the resulting issues that would have been caused if left unnoticed.
