Volvo Penta D4 hydraulic steering

smallgraham

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8 Feb 2020
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After recent replacement of the steering rams on a VP twin D4 set up, oil is being pumped out of the air vent cap on top of the helm steering pump. The valve - 3588306 part number - screws into the top of the pump. Everything is fine until the engines have been running for a few minutes and then oil starts pumping out. Any ideas! Thanks in advance and I hope this is posted in the correct group.
 
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