Heckler
Active member
The diesel injection doesnt and isnt intended to lubricate the bores. The vast majority of plain shell bearing engines have a drilling up the conrod which exits about halfway up where the pressurised oil from the big ends sprays out to cool the underside of the pistons and to lubricate the piston rings and bore. You will see behind the piston rings, holes that allow this. You will see in the shell bearings a hole in one of them that allows access to the conrod oil drilling from the big end oil supply. In some cases, like my MD22, there are little pipes that are connected to the main crank case oil gallery by banjo bolts that are open ended and point in to the bores and do the same job.An interesting theory and not something I have ever observed so strongly with petrol engines but I can well understand that diesel engines will behave differently and that to run freely the bore does need some diesel lubrication until the engine starts and splash lubrication from the sump can take effect. The only thing which suggests another issue is that you observed plenty of fuel at the injectors so I would have expected sufficient bore lubrication but, as you say, if it works, it works.
Richard
Stu