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| oil pressure drops when hot https://ukbeg.com/forum/viewtopic.php?f=8&t=166 |
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| Author: | gunter [ 08 May 2009 14:58 ] |
| Post subject: | oil pressure drops when hot |
I often get the oil pressure lamp lit at the XB12 when the engine is hot - e.g. stop and go in the city. I first assumed it's a defective pressure switch or a chafed/grounded cable, but when listening, I can hear the tapets knocking. The noise disappears as soon as the oil lamp gets off again. This typically happens when in idle (~1000 rpm) or at low rpm. So I assume the pressure switch is working as intended. Oil viscosity is 10W40 or 15W50, can't tell anymore if I changed oil before or after getting a new charge. What might be the reason for the low pressure? Do i need a new oil pump? |
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| Author: | Adam [ 08 May 2009 15:15 ] |
| Post subject: | Re: oil pressure drops when hot |
My first thought would be to use the correct grade of oil ie 20/50. |
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| Author: | Charlie (Buzz) 716 [ 08 May 2009 15:26 ] |
| Post subject: | Re: oil pressure drops when hot |
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| Author: | whichway? [ 08 May 2009 18:33 ] |
| Post subject: | Re: oil pressure drops when hot |
hi Gunter ,i think your idle speed is too low, my xb is 1050rpm hot ,also best on HD engine oil HTH ...........whichway? |
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| Author: | THE FLYING DUCHMAN [ 08 May 2009 19:03 ] |
| Post subject: | Re: oil pressure drops when hot |
Hi Gunter. As I recall 20W50 was made for air cooled V-Twins in the first place. Why are you not using the right grade of oil as per HD. Stick to the same brand oil, I use Torco and the K&N oil filter, and change at 2.5K or less. Pressure test the oil system, if needed, after using the right grade of oil and a new filter. If the oil light still comes on do not continue to run it. It should be fine at 1000rpm hot. Mine is. The oil is part of the cooling system and vital on a Buell. |
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| Author: | THE FLYING DUCHMAN [ 08 May 2009 19:12 ] |
| Post subject: | Re: oil pressure drops when hot |
Quote: but when listening, I can hear the tapets knocking. The tapets are Hydraulic and low oil pressure or the wrong grade oil will cause this. The wrong grade oil is a common mistake and can be a killer. |
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| Author: | Maz [ 08 May 2009 19:30 ] |
| Post subject: | Re: oil pressure drops when hot |
Just delete the problem using EcmSpy 
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| Author: | Adam [ 08 May 2009 19:32 ] |
| Post subject: | Re: oil pressure drops when hot |
or take the warning lamp out 
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| Author: | THE FLYING DUCHMAN [ 08 May 2009 19:37 ] |
| Post subject: | Re: oil pressure drops when hot |
Quote: Just delete the problem using EcmSpy A handy one to know this is  .
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| Author: | Nate [ 09 May 2009 18:38 ] |
| Post subject: | Re: oil pressure drops when hot |
That oil could be like water when hot Gunter, get a good Diesel grade 20/50 in her asap. Nate. |
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| Author: | gunter [ 09 May 2009 20:01 ] |
| Post subject: | Re: oil pressure drops when hot |
Oil in engine was 10W50, I found an old bottle. I will give it a try and change to 20W50 as soon as I have some, but my experience tells me, that MY bikes do not like easy solutions. The gerotors look like new, clearance is within limits, the oil pump gear (golden one) shows some wear (IIRC it would be in now for about 7000 mls), so I exchanged it for the unbreakable from LuckyHands. |
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| Author: | THE FLYING DUCHMAN [ 09 May 2009 20:16 ] |
| Post subject: | Re: oil pressure drops when hot |
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| Author: | thecoldplace [ 10 May 2009 19:25 ] |
| Post subject: | Re: oil pressure drops when hot |
Gunter, I'm amazed and aghast at a technical type chap like yourself running your bike(s) with basically the wrong oil in it, and then finding that you have major engine failure on your Buell. HD's own 20W50 is the correct oil for your bike, put it in a crack on! |
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| Author: | gunter [ 10 May 2009 21:06 ] |
| Post subject: | Re: oil pressure drops when hot |
Gemach, gemach, mein guter Freund. The bike's ready, awaiting an oil refill (and a new front isolator). We'll see then if 20W50 will give better results than 10W50. Well, I am pretty sure to know the answer already ... |
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| Author: | pash [ 10 May 2009 21:08 ] |
| Post subject: | Re: oil pressure drops when hot |
gunter wrote: Well, I am pretty sure to know the answer already ... Pray tell germanic friend... |
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