nscottschafer
Recruit
- Joined
- Jun 13, 2015
- Messages
- 5
Hello, I have a 1995 Volvo Penta 7.4 GL PHUS with a DP-D1 Lower Unit. The VP has always ran great since I purchased it four years ago, however I do all my boating on a river which has lots of sandbars and the VP does not like sand or should I say loves sand and gulps it up every chance it can. This causes lots of overheating issues so i am constantly watching my temp guage and cleaning sand out of coolant hoses. I usually shut engine down before it gets to 200 degrees. About a month ago I decided to change the Head gasket and all other corresponding gaskets due to problems at the end of last season.
Here is what I did to my boat (1995 Larson 280 Cabrio) and the problem I am having. I replace the head gaskets, intake gaskets, exhaust gaskets, Manifold riser gaskets, cleaned the cylinder heads and Valves to a smooth shine and also surrounding areas and parts. I made sure to install valves back in to the same place they came from and lapped the valves also. I assembled everything back together and decided I wanted to install a new distributor as my old prestolite distributor was looking pretty rough. I purchased a Pertronix D200801 Flame Thrower with a 45001 Coil, installed and set engine at TDC. I have everything torqued down and Distributor at TDC and set initial timing.
Here is the problem I am having, The engine turns over but every now and then I get a loud almost like a vapor lock noise like the compression is too much and the engine doesn't want to turn over. When it does crank it sounds good but simply won't fire almost like it's getting no gas. I took fuel pump off and it is working fine. I siphoned gas and replaced with fresh gas. I just took the carb off and it was full of gas and lots of gas resting on top of the intake under the carb. I am all out of ideas and if anyone would like to share there words of wisdom I would sure appreciate it greatly.
Please let me know if there is any more information you need from me to help diagnose this problem. This is my first post in a foru and I look forward to hearing ideas form my fellow iboat members!!!
NSS
Here is what I did to my boat (1995 Larson 280 Cabrio) and the problem I am having. I replace the head gaskets, intake gaskets, exhaust gaskets, Manifold riser gaskets, cleaned the cylinder heads and Valves to a smooth shine and also surrounding areas and parts. I made sure to install valves back in to the same place they came from and lapped the valves also. I assembled everything back together and decided I wanted to install a new distributor as my old prestolite distributor was looking pretty rough. I purchased a Pertronix D200801 Flame Thrower with a 45001 Coil, installed and set engine at TDC. I have everything torqued down and Distributor at TDC and set initial timing.
Here is the problem I am having, The engine turns over but every now and then I get a loud almost like a vapor lock noise like the compression is too much and the engine doesn't want to turn over. When it does crank it sounds good but simply won't fire almost like it's getting no gas. I took fuel pump off and it is working fine. I siphoned gas and replaced with fresh gas. I just took the carb off and it was full of gas and lots of gas resting on top of the intake under the carb. I am all out of ideas and if anyone would like to share there words of wisdom I would sure appreciate it greatly.
Please let me know if there is any more information you need from me to help diagnose this problem. This is my first post in a foru and I look forward to hearing ideas form my fellow iboat members!!!
NSS