Startup noise?

[royaldo]

Hi,

I have this high frequency rattle noise on either my motor or gear on startup. Any suggestions to what this could be coming from?

https://www.youtube.com/watch?v=u0Qy-9ihJ0Y

It's a Volvo Penta TAMD70B with a Velvet drive (Borg Warner) AS7-73C gear. It sounds like its coming from the gear area, gear oil pump maybe? The noise is only present on startup and disappears in 1-2 seconds.

 

[BruceK]

If it was me I'd be looking to see if the starter motor pinion gear was not engaging /disengaging properly first

 

[royaldo]

If it was me I'd be looking to see if the starter motor pinion gear was not engaging /disengaging properly first

Thanks, I'll start with that. Don't know why I didnt think about that one first.

 

[diehard]

Sounds very like the starter sticking. This happened to me and I succeeded in burning out the starter and almost caused a fire. Check it out.

 

[DavidJ]

The pre-engage starter motor has a roller clutch to prevent the engine winding up the starter motor after start up. If the pinion retraction is a bit gummed up then the clutch has a lot of work to do and the noise could be a failing roller clutch.

 

[volvopaul]

Luvly looking engine

 

[volvopaul]

Sounds like an old Perkins 6354 on start up , it will have the old screw type gear that engages with the flywheel so could just be that is a bit dry .

 

[royaldo]

Luvly looking engine

Thanks, previous owner didnt forget the upkeep It's the original engine from 1975 (one rebuild in the 90's)

 

[royaldo]

I got the starter off. Didnt look too bad inside, starter wheel moves easily in/out but it isnt exactly dripping of oil.

IMG_20171125_193417.jpg

IMG_20171125_193439.jpg

IMG_20171125_193501.jpg

IMG_20171125_193750.jpg

https://youtu.be/3jVQeIFR9Ns

Are there better idea's to check functionality than lubing it up and mount it again and test? Heat exchangers are disassembled and in for a cleaning, so can't start the engine up right now anyway

 

[QBhoy]

Just sounds like the mech fuel pump to me.

 

[royaldo]

Just sounds like the mech fuel pump to me.

Liftpump and injection pumpe are new/just rebuild. Noise was there before and after

 

[royaldo]

I have had problems with the starter relay just clicking a few times before the starter would activate and crank the engine over (starter battery at 24V/360AH and fully charged). Is it possible for the solenoid be be sticking a bit and cause the starter not to release for a few seconds?

 

[BruceK]

Yes, or it could be an electrical issue as well. Are your batteries at full capacity as opposed to just fully charged? i.e. batteries not degraded through age. i.e. Are you getting enough volt /Amps to the starter motor. If the electricals all check out I'd focus on the solenoid unless you have a spare you can change over and check with. Start with the electrics though.

 

[royaldo]

Yes, or it could be an electrical issue as well. Are your batteries at full capacity as opposed to just fully charged? i.e. batteries not degraded through age. i.e. Are you getting enough volt /Amps to the starter motor. If the electricals all check out I'd focus on the solenoid unless you have a spare you can change over and check with. Start with the electrics though.

Yes, the batteri pack used for starting was changed out just before I bought the boat last year. It also runs the bow thruster without problems. Cables to starter are fairly short (a little over a meter) and in good condition.

I took the cover of the starter. It smells very burnt and the contact points seems to be eaten away, and the oil plug in the front is corroded and stuck. I'm probably sending it out to get it rebuilt or replaced. It seems to be a fairly common starter (881683) used on TAMD60, 61, 70, 71, 72....

 

[BruceK]

A burnt out starter can be indicative of a low voltage draw. Lower Voltage = higher amp draw (to do the work) = greater heat & burnt contacts etc. Once repaired I'd do a check on voltage drop when starting. If it drops to ~9v while starting I'd still investigate. It should be able to hold at least 10V for ~20 seconds while starting

Edit.

i.e. Look for the cause as well as the cure.

 

[royaldo]

A burnt out starter can be indicative of a low voltage draw. Lower Voltage = higher amp draw (to do the work) = greater heat & burnt contacts etc. Once repaired I'd do a check on voltage drop when starting. If it drops to ~9v while starting I'd still investigate. It should be able to hold at least 10V for ~20 seconds while starting

Edit.

i.e. Look for the cause as well as the cure.

Yes good idea. Voltage dropped to about 11.3-11.5V (it's a 24 volt system - starter rated at 5.4 kW) while cranking engine after changing out injection pump. I checked that on my battery monitor (digital Victron Energy - not the old analog gauge) knowing that I've had problems with the starter through the season. I am (at least) changing out connectors on the starter cables to make sure the connection is good. Those did get a little hot while cranking for an extended time (15-20 sec).