B bartles Well-Known Member Jun 12, 2026 #1 Model: 407577-0292-E1 Anyone got a clue what this is.....you can scratch through it....but resists chem-cleaners and varsol. It runs from the dipstick tube hole to the top of the crankcase. Attachments PXL_20260612_200646333.MP.jpg 1.9 MB · Views: 6 PXL_20260612_200636269.jpg 1.5 MB · Views: 6
Model: 407577-0292-E1 Anyone got a clue what this is.....you can scratch through it....but resists chem-cleaners and varsol. It runs from the dipstick tube hole to the top of the crankcase.
B bartles Well-Known Member Jun 12, 2026 #3 ILENGINE said: Looks like oil coking. basically oil burnt into carbon. Click to expand... I can't see any evidence of overheating so probably a result of low maintenance. Thanks for the reply, bartles
ILENGINE said: Looks like oil coking. basically oil burnt into carbon. Click to expand... I can't see any evidence of overheating so probably a result of low maintenance. Thanks for the reply, bartles
