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need help with lycoming h2ad

Posted: Mon Jul 28, 2014 9:22 am
by Jon stalzer
I recently bought a h2ad and got it on my boat and noticed oil pressure was at 10psi hot is the any other reason for low oil pressure besides main bearings before I split the case? Oil pump was a little worn and the oil pressure relief ball was a little rough and there is 7 washers in the relief valve. Also could I use angle valve cylinders in this motor or can I only use the h model cylinders

Re: need help with lycoming h2ad

Posted: Mon Jul 28, 2014 10:24 am
by woods and water
Bad bearings and that is a wide deck

Re: need help with lycoming h2ad

Posted: Mon Jul 28, 2014 10:39 am
by Jon stalzer
Yes it's a wide deck if you were asking so could I use 0320 angle valve cylinders if there also wide deck?

Re: need help with lycoming h2ad

Posted: Mon Jul 28, 2014 11:12 am
by diamondback0320
I have h model also,dont think u can use other cylinders bcause the valve train & lifter is different

Re: need help with lycoming h2ad

Posted: Mon Jul 28, 2014 11:18 am
by Jon stalzer
tonyld67 wrote:I have h model also,dont think u can use other cylinders bcause the valve train & lifter is different
Do you know where I can find main bearings that aren't 43 dollars+ a half?

Re: need help with lycoming h2ad

Posted: Mon Jul 28, 2014 2:10 pm
by diamondback0320
Pm sent jon

Re: need help with lycoming h2ad

Posted: Tue Jul 29, 2014 8:48 am
by Jon stalzer
Would a fairly pitted oil pressure relief ball cause oil pressure to be this low?

Re: need help with lycoming h2ad

Posted: Tue Jul 29, 2014 8:57 am
by Deano
Realistically . . . . no.

Re: need help with lycoming h2ad

Posted: Tue Jul 29, 2014 9:53 am
by diamondback0320
If its not seating right I think it could imo,but could b wrong

Re: need help with lycoming h2ad

Posted: Tue Jul 29, 2014 9:54 am
by diamondback0320
Does the pressure come up when u bring rpm up?

Re: need help with lycoming h2ad

Posted: Tue Jul 29, 2014 10:19 am
by Jon stalzer
Oil pressure does come up but not by much. 10 psi idle to maybe 20 to 25 at 1200

Re: need help with lycoming h2ad

Posted: Tue Jul 29, 2014 10:25 am
by diamondback0320
Mmm,maybe a weak spring & pitted ball,if all screens r clean,if the parts dnt cost u much Iwould try sping & ball /4 splitting case! Just a thought

Re: need help with lycoming h2ad

Posted: Tue Jul 29, 2014 10:35 am
by diamondback0320
Ive owned 2 of these motors & never had a problem with low oil pressure,now have seen fluctuations & screen was dirty or pitted ball,on another note I just done top job on mine & my oil pressure changed & cant figure out why,before the top job my pressure was 75 cold at 1800rpm &70 up ta temp at same rpm & 50 idle up to temp,now whenI take off cold my gauge says 100 for bout 5minutes & then drops back to 70 running & 45-50 idle,don't understand that 1,top job has nothing to do with oil pressure,havnt got that figured out yet!

Re: need help with lycoming h2ad

Posted: Tue Jul 29, 2014 11:22 am
by Jon stalzer
I was at about 30 with warm engine not hot then changed a cylinder with new rings and ran at jolly a couple weeks ago it was my first time out with my new hull and this motor. I screwed with the ball a little and my oil pressure went even lower I'm gonna grab a new ball and spring from Don George inn my way home today and see if that fixes it but I'm not getting my hopes up

Re: need help with lycoming h2ad

Posted: Tue Jul 29, 2014 3:43 pm
by GMAC 76
tonyld67 wrote:Mmm,maybe a weak spring & pitted ball,if all screens r clean,if the parts dnt cost u much Iwould try sping & ball /4 splitting case! Just a thought
X2.....weak spring AND pitted ball could easily be the problem....easy and cheap to find out!

Re: need help with lycoming h2ad

Posted: Tue Jul 29, 2014 4:56 pm
by Jon stalzer
On my way home with the goods well see what happens

Re: need help with lycoming h2ad

Posted: Tue Jul 29, 2014 4:56 pm
by Jon stalzer
On my way home with the goods well see what happens

Re: need help with lycoming h2ad

Posted: Tue Jul 29, 2014 6:34 pm
by GMAC 76
Jon stalzer wrote:On my way home with the goods well see what happens
don't forget even the new spring and ball could need a few shims to get ya where ya want to be pressure wise

Re: need help with lycoming h2ad

Posted: Tue Jul 29, 2014 9:53 pm
by Jon stalzer
Looks better, all fixed

Re: need help with lycoming h2ad

Posted: Tue Jul 29, 2014 10:32 pm
by diamondback0320
Good deal bud,glad that worked for ya!