Drew’s Technical News Report!

Finally put the fresh gasket and seals on the valve cover, and set the tappet clearances (which were way off) a week ago. Once all the oil was cleaned from the area I could see if the oil seepage continued, and it did. Unfortunately it did not only continue to seep from the valve cover, but oil seems to be bubbling up from the head bolts as well (even after being re-torqued). All the breather’s are cleaned out, but there seems to be pressure building up somewhere, enough to force oil and air up through the head bolts. Anyone have any ideas?


7 responses

  1. Howdy Drew. Sorry to hear of your issues. The only place a healthy engine develops significant pressure is in the cylinders. The first place I would look for an excess pressure in the crankcase is at the “valve stem guides”. If the guides wear beyond a certain point, a portion of the exhaust gases can be forced past them and into the crankcase. This leakage will cause an overpressure situation in the crankcase. Another check for burned valves; hang a dollar bill over the end of the tailpipe. In a healthy engine – no burned valves, the dollar bill will always flutter away from the end of the pipe. If you have burned exhaust valves, they do not completely seal the cylinder during the intake stroke. The dollar bill will snap back against the end of the tailpipe causing a “popping” sound every time an intake valve opens. All intake air should enter through the open intake valve – the exhaust valve tightly shut. If there is leakage around the burned exhaust valve, a portion of the intake air will be sucked from the improperly sealed exhaust valve on the intake portion of the stroke. Pop. pop, pop, rhythmically. Either way; guides, or valves – a valve job will cure the issue…

    Wish I could be there to do some wrenching for you, David in Fort Myers

  2. I’m at the Maine Winter Romp with a group of Land Rover enthusiasts. I’ll be posing your questions to them. Also, don’t forget to contact Scott Preston in Nashville. He knows your engines very well!

    Jeff Aronson

  3. Hi guys..spotted your Rover in the Walmart parking lot a couple of weeks ago ( Mobile, Al) actually stopped and took a picture as we own and operate the best Rover repair shop in Mobile. We’re family owned and we all drive Rovers. Just finished reading the article in Rover’s Magazine as well. Sounds like you’re living the dream.

  4. Hi guys. Just read the article in Rovers magazine. Sounds like you’re having a blast! I do have a couple of things to say about your problem though. While I agree with David about exhaust leaking into the crankcase through the valve guide seals, the only way that would happen is if you in fact did have a valve that isn’t seating properly. That’s possibly your issue with the valve cover gasket. But oil leaking up through the head bolts? That sounds like a different issue. The bolts go through the head into the block, but don’t have any contact with oil channels normally. The only place that oil might find its way up the shaft of the bolts is where the head meets the block. In other words, I believe you have a head gasket that has become damaged and is leaking oil where it shouldn’t be. This would be exacerbated if there were undue pressure in the crankcase. The good news is that these engines are very simple, and removing the head, replacing the head gasket, re-grinding or replacing the valves, and putting all new guide seals in is almost a side-of-the-road repair and not too expensive. It can be done in a day and you don’t have to remove any timing or re-set clearances or anything too complicated. I could literally walk you through it on the phone if it came to that. So that’s my diagnosis. I live in Richmond Virginia, but I haul boats throughout the east from Florida to Massachusetts and surrounding areas. If you need help or advice or need a walkthrough on most anything I’ll include my number here. You never know, I just might be coming through and I don’t charge anything for turning wrenches on rovers (and I do keep a lot of wrenches in my rig). My first car was a 1965 IIa; I’ve still got him and he runs like a champ. I hope y’all continue to enjoy your adventure! Stay safe.

    Ben Beckendorf
    Here’s my # (4 zero 7) 221 842five

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