Rob Posted August 2, 2007 Share Posted August 2, 2007 I've got an oil leak in my V8 Mack engine that is coming from one of the "buttress" bolts through the side of the block to the number three main bearing cap. My question is can I remove the bolt, after cleaning apply sealer to the threads and or a gasket and retorque the bolt? Should I remove the oil pan, and remove the main cap bolts first? Never worked on this engine other than the governor and it doesn't leak oil anyplace else.Thanks,Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/2713-oil-leak/ Share on other sites More sharing options...
fjh Posted August 2, 2007 Share Posted August 2, 2007 Remove the bolt 5/8 12 piont! clean out the hole a bit with brake clean Apply sealant to the washer and bolt head re install and torque to 90 foot pounds! Quote Link to comment https://www.bigmacktrucks.com/topic/2713-oil-leak/#findComment-13240 Share on other sites More sharing options...
Freightrain Posted August 3, 2007 Share Posted August 3, 2007 Like on an FE Ford, the cross bolts can be removed and re-installed without fuss as they are put in last anyway and don't affect main bolt torque.Does the Mack have spacers? Or does the cap come right over to the side of block? Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/2713-oil-leak/#findComment-13253 Share on other sites More sharing options...
Rob Posted August 3, 2007 Author Share Posted August 3, 2007 Like on an FE Ford, the cross bolts can be removed and re-installed without fuss as they are put in last anyway and don't affect main bolt torque.Does the Mack have spacers? Or does the cap come right over to the side of block?Hi Larry, thanks for the input. I do not know if there are spacers or not. The pan gasket appears to be fairly new, (under all the grease buildup) and I've not had it apart. It only leaks at the one bolt and I've done nothing with it yet.Thanks,Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/2713-oil-leak/#findComment-13254 Share on other sites More sharing options...
Freightrain Posted August 3, 2007 Share Posted August 3, 2007 Here is a shot of the bottom of my race motor. I usually put a dab of silicone on the washers before putting side bolts in. These motors use spacers to make up the space between block and cap. I just wondered as the spacer MIGHT fall out if you pull bolt out. It shouldn't but if it's a loose enough fit it might drop enough to not get bolt back in. When putting it together you torque mains, then install side bolts and pull down to 42lb/ft.I've never seen the bottom of a V8 Mack so I was curious. Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/2713-oil-leak/#findComment-13255 Share on other sites More sharing options...
MACKTRUCKS4 Posted August 18, 2007 Share Posted August 18, 2007 There are no spacers on my 500 V-8. Caps go right up to the block. I do not know if the older V-8's are the same. Quote Live every day like it's your last, because one of these days, it will be. Link to comment https://www.bigmacktrucks.com/topic/2713-oil-leak/#findComment-13434 Share on other sites More sharing options...
Rob Posted August 18, 2007 Author Share Posted August 18, 2007 There are no spacers on my 500 V-8. Caps go right up to the block. I do not know if the older V-8's are the same.Thank you for your reply. HK Trucking had sent me a scan verifying that there were no spacers in this engine. The repair went flawless and no longer leaks.Thanks again to all,Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/2713-oil-leak/#findComment-13436 Share on other sites More sharing options...
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