G'day, my first post after quite years of observing the issues of others and applying the results to my old girl.
The issue I have been having with my vehicle is the pushing out of the coolant to the point where it generally has to be topped up daily. On opening the coolant reservoir there was always an escape of air/gas. I finally decided to remove the head which I suspected was the issue ( number six spark plug was wet on inspection whereas all others were dry.
The attached photographs show:
1.The head gasket on the block between cylinders four and six
2.The inner head bolt location between cylinders four and six
3.The inner head bolt from between cylinders four and six
4.The block in the location of cylinder/piston six showing head bolt location between cylinders four and six with gasket removed
The block has had "top hat" cylinder liners installed about ten years ago and there is no damage to the head or the block due to the action of the combustion gases.
My query, which I trust someone can answer is how did the combustion gas get into the coolant as there are no coolant passages between the head and the block in the central area of the head. From what I have read elsewhere the installation of the "top hat" liners should remove the likelihood of combustion gas entering the coolant chamber through small cracks in the block around the liners.
1. Head gasket on block between cylinders four and six
While the gasket has burnt out from both cylinders 4 and 6 into the upper hole for the head bolt the gasket "fire ring' in the vicinity of the lower/outer bolt hole shows signs of future burn through from cylinder 6
2. The inner head bolt location between cylinders four and six
3. The inner head bolt location between cylinders four and six
4. The block in the location of cylinder/piston six showing head bolt location between cylinders four and six with gasket removed
Any comments/solutions would be greatly appreciated.