Hello,
I'm new to this forum, I've been reading for the past month or so and have used the search alot too. Thanks for all the good advice already. I have a bit of a strange problem. I bought a '75 240d about three weeks ago. The car drives well and has good power for a 240. It has soom pretty minor rust issues and the seats would benefit from repadding, but overall its pretty nice, and I really like the 115 240d. I found out after I bought that its using alot of oil, about 1 quart per 100-150 miles. It doesn't leak much at all. It has a fair bit of blowby. I did a cold compression test.
#1- 300
#2- 330
#3- 375
#4- 400

Well to get to the point, today I went to replace the valve stem seals and found out that #4 intake valve guide is not pressed into the head and is just floating around on the valve. Have any of you ever heard of this happening? Any idea about why (I fear a cracked head). I'm also wondering what kind of damage to the valve guide hole may have been done. Am I right to assume that this is where the oil is going? Also is this why the compression on #4 is so high? I will have to pull the head to address this won't I? I'll probably try to get the head pulled tonight so that I can maybe look things over and order parts tommorow.


Thanks,
Colin Kenny

Hello again,
The guide actually seems to have cracked off more or less level with the guide hole. There is a lot of wobble in the valve.

Thanks again,
Colin Kenny

Pull the head and get it fixed.....................thats the source of your oil consumption.

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ckenny,

The compression may be higher in that cylinder because of a carbon build up from burning so much oil in one cylinder. You might check the pre-chamber for carbon build up too.

While the had is off, you might do a valve job on all the valves.

P E H

Hello all,

Thanks for your responses. I will be checking out all the valves while I have the head off. I don't have service records for the vehicle, but I wonder if the car had a valve job done before. Maybe the valve guide was cracked off when they pressed it in. I can't imagine why else it would have broken.

Thanks,

Colin Kenny