SoCal Jet Boats

Tech Talk => Engine Mechanical / Electrical => Topic started by: 1972Challenger on October 31, 2010, 10:34:50 PM

Title: no oil pressure on gauge
Post by: 1972Challenger on October 31, 2010, 10:34:50 PM
ok so since it was a nice day yesterday i decided to uncover my boat and just let it run for a little bit... i made sure everything was ok, then started her up.. suprisingly it started right away... but i noticed on my oil pressure gauge that there was no pressure... the needle didnt move... now i know thats bad.... so i checked the oil level.. and it was good...

wat else can it be.. can the gauge be bad?? or something.... im happy i realized this now... since i got time to deal with it
Title: Re: no oil pressure on gauge
Post by: IRRebel on October 31, 2010, 10:48:05 PM
Had a similar problem this summer.We didn't quite figure it out then, but a little later.

Dunno what engine you gots, but the oil pressure loss in my Ford was due to 2 lifters popped from the bores. The problem that caused THAT was hydrolocking (2 extremely bent pushrods, 2 jacked up roller rockers).

My running it anyways, thinking it was the guage, spun 4 rod bearings and pretty much ruined the engine. Time to tear it down, in other words............. ;)

Ray
Title: Re: Re: no oil pressure on gauge
Post by: Nordie on November 01, 2010, 06:02:26 AM
I had no oil pressure a while ago too...so reached under the dash and put the ground wire back on the guage....then about a month later i had no oil pressure again...but that was an oil pump that decided to shear off
Title: Re: no oil pressure on gauge
Post by: crewchief22 on November 01, 2010, 06:34:23 AM
Double check the wiring behind the dash before tearing into the engine.  Most of the time you will find a poor connection, but sometimes you will find mass destruction inside the engine  :banghead:
Title: Re: no oil pressure on gauge
Post by: mash on it on November 01, 2010, 07:56:21 AM
Double check oil pressure with a mechanical gauge first, seen many electrical senders and gauges go bad, weather, water, vibration, etc.

Daniel
Mash on it
Title: Re: no oil pressure on gauge
Post by: 1972Challenger on November 01, 2010, 12:07:44 PM
i hope its something simple.. i had it out at havasu a few months ago and she ran great.. and when i started it up she still sounded good... nothing had really changed....
Title: Re: Re: no oil pressure on gauge
Post by: Nordie on November 01, 2010, 01:59:46 PM
Cant you just ground the sending unit to the block? If the guage jumps all the way up you can confirm that the sending unit and gauge is working....if the guage doesnt move you can verify that something isnt working....
Title: Re: Re: no oil pressure on gauge
Post by: GT Jets on November 01, 2010, 03:01:05 PM
Cant you just ground the sending unit to the block? If the guage jumps all the way up you can confirm that the sending unit and gauge is working....if the guage doesnt move you can verify that something isnt working....

NO!

No you can't, that is the easy way out and we will have none of that!!   ;D




Yes, this is the best idea yet... :thumbup:

Jumper the terminal on the sending unit to ground and turn on the key, gauge should go passed the 100% mark. Then you can eliminate the gauge, then get a mechanical gauge (used works best  :sly: ) and see if the engine is making any oil pressure. If not, that sucks, if so....sweet! your only out a sending unit... :thumbup:

Seeing as I have had dozens of boats apart in the last 20 years, I'm betting on a wiring issue or a bad gauge... ;)

GT
Title: Re: no oil pressure on gauge
Post by: electrowoman on November 04, 2010, 09:18:13 AM
If you want to know for sure like right now...  take the oil pressure sender out and hold a rag over the hole.  Take off the coil wire and have someone just bump the engine over.   If you aren't cleaning up oil you have a problem.

Warning:   Don't look in the hole and have someone else bump it over   ;D

Title: Re: no oil pressure on gauge
Post by: 1972Challenger on November 04, 2010, 04:34:00 PM
sounds like a plan
Title: Re: no oil pressure on gauge
Post by: Rogers Hopeful on November 05, 2010, 12:54:50 AM
had a similar problem on the rogers except it would peg the needle way past 80 and we didnt have great oil pressure bc the pump was shot(Brand new pump) put in a new gauge and saw the incredibly low oil pressure...  :banghead:
Title: Re: no oil pressure on gauge
Post by: 78 Crusader on November 05, 2010, 06:31:29 AM
had a similar problem on the rogers except it would peg the needle way past 80 and we didnt have great oil pressure bc the pump was shot(Brand new pump) put in a new gauge and saw the incredibly low oil pressure...  :banghead:

Ya, I just bought my Crusader a few months ago. The prior owner had an automobile sender to a marine guage so the Ohms were different. I put a marine sender on it and now the oil guage works properly.