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340 oil pump gasket? #1300466 09/09/12 03:49 PM 09/09/12 03:49 PM
Joined: Aug 2011 Posts: 127 Az H HOT IN AZ OP member
HOT IN AZ OP member H Joined: Aug 2011 Posts: 127 Az	Changing the oil pan on my 340 Demon and naturally I needed to change the pickup. Had to remove oil pump from engine and noticed there wasn't a gasket there. I did not originally assemble this motor so I can't say as there was a gasket supplied. Looking at various sites and some suppliers show a gasket and some don't. Dodge shop manual says nothing about a gasket. Oil pressure was good, 100psi at 6000rpm maybe a little high. Question is "should I use a gasket"? Thanks for your replies

Re: 340 oil pump gasket? [Re: HOT IN AZ] #1300467 09/09/12 03:55 PM 09/09/12 03:55 PM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	Quote: Changing the oil pan on my 340 Demon and naturally I needed to change the pickup. Had to remove oil pump from engine and noticed there wasn't a gasket there. I did not originally assemble this motor so I can't say as there was a gasket supplied. Looking at various sites and some suppliers show a gasket and some don't. Dodge shop manual says nothing about a gasket. Oil pressure was good, 100psi at 6000rpm maybe a little high. Question is "should I use a gasket"? Thanks for your replies Dont bother... its not needed

Re: 340 oil pump gasket? [Re: MR_P_BODY] #1300468 09/09/12 06:12 PM 09/09/12 06:12 PM
Joined: Jan 2003 Posts: 2,129 Vermont T TrWaters top fuel
TrWaters top fuel T Joined: Jan 2003 Posts: 2,129 Vermont	Not used in all applications, although most new pumps do come supplied with a gasket. Some people just feel better with using one. The SB gasket is available from AR Engineering or myself. I know of no other gasket manufacturers that offer them.

Re: 340 oil pump gasket? [Re: TrWaters] #1300469 09/09/12 08:51 PM 09/09/12 08:51 PM
Joined: May 2006 Posts: 1,260 New Mexico A Adobedude pro stock
Adobedude pro stock A Joined: May 2006 Posts: 1,260 New Mexico	I've been here long enough to know this has the potential to end up like a pinion angle thread.. In any event I didn't use one on my 408. 2001 Dodge Dakota 408 All Motor 11.27 @ 117.83 mph 2017 NM Mopar Challenge Series Champion.

Re: 340 oil pump gasket? [Re: TrWaters] #1300470 09/09/12 08:51 PM 09/09/12 08:51 PM
Joined: Nov 2004 Posts: 892 USA K krw71ragtop super stock
krw71ragtop super stock K Joined: Nov 2004 Posts: 892 USA	I just make the gasket out of a cereal box.

Re: 340 oil pump gasket? [Re: krw71ragtop] #1300471 09/09/12 08:55 PM 09/09/12 08:55 PM
Joined: Dec 2006 Posts: 3,396 Pa Hot 340 master
Hot 340 master Joined: Dec 2006 Posts: 3,396 Pa	Quote: I just make the gasket out of a cereal box. Too thick of material, and asking for a problem IMO .. just leave it out, its what the factory did.

Re: 340 oil pump gasket? [Re: Hot 340] #1300472 09/09/12 10:41 PM 09/09/12 10:41 PM
Joined: Nov 2004 Posts: 892 USA K krw71ragtop super stock
krw71ragtop super stock K Joined: Nov 2004 Posts: 892 USA	To clarify, after I make the gasket I peel off the smooth side basikely peeling the gasket in half, then just use the cardboard side of it. Done this on 2 stroker motors and several stock motors with more than enough oil preasure. Or dont use one at all as stated above. Just wanted to make the point that he doesnt have to go out and buy one.

Re: 340 oil pump gasket? [Re: krw71ragtop] #1300473 09/09/12 11:06 PM 09/09/12 11:06 PM
Joined: Jan 2003 Posts: 5,486 SoCal Brian Hafliger master
Brian Hafliger master Joined: Jan 2003 Posts: 5,486 SoCal	If that gasket fails, it'll have real low psi and cause engine failure. Don't use it!! Brian Hafliger

Re: 340 oil pump gasket? [Re: krw71ragtop] #1300474 09/10/12 12:03 AM 09/10/12 12:03 AM
Joined: Oct 2003 Posts: 7,506 Az Crizila master
Crizila master Joined: Oct 2003 Posts: 7,506 Az	Quote: To clarify, after I make the gasket I peel off the smooth side basikely peeling the gasket in half, then just use the cardboard side of it. Done this on 2 stroker motors and several stock motors with more than enough oil preasure. Or dont use one at all as stated above. Just wanted to make the point that he doesnt have to go out and buy one. Probably won't be a problem if it was a Wheaties box . Melings come with a gasket. Every factory motor I have ever taken apart had a gasket. Works fine both ways though. Fastest 300

Re: 340 oil pump gasket? [Re: Crizila] #1300475 09/10/12 12:54 AM 09/10/12 12:54 AM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	Probably won't be a problem if it was a Wheaties box . Melings come with a gasket. Every factory motor I have ever taken apart had a gasket. Works fine both ways though. Thats weird.... I have only seen 1 in a engine... the gasket comes with a new pump and I have a FEW of them hanging on a nail in the shop... needless to say I dont use them... I have seen some caps that had a pretty rough surface on them and I just use some 400 paper on the surface plate to smooth out the surface

Re: 340 oil pump gasket? [Re: MR_P_BODY] #1300476 09/10/12 09:41 AM 09/10/12 09:41 AM
Joined: Jan 2003 Posts: 2,129 Vermont T TrWaters top fuel
TrWaters top fuel T Joined: Jan 2003 Posts: 2,129 Vermont	Like I mentioned, some guys just feel better having a gasket there. The early hemis use the same style main cap and pump. I have never found a base gasket in a passenger car application. BUT....every marine engine has had the gasket.

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