d.p Posted February 20, 2017 Report Share Posted February 20, 2017 Noticed this bolt on the front was spinning freely so I went to hand tighten it and it sheared right off. Not even sure what these bolts are called. Anyone ever had to drill one of these out? If so what did you use? Ok to drive it like this until I can get it fixed? Looking for a replacement but no luck. Quote Link to comment
datzenmike Posted February 20, 2017 Report Share Posted February 20, 2017 Yeah not that serious. It helps pull the timing cover and the bottom of the head together. It only seals in fumes and maybe some oil splash. Probably won't even leak. 1 Quote Link to comment
d.p Posted February 20, 2017 Author Report Share Posted February 20, 2017 Thanks Mike, what is the bolt called? Got a link to a replacement? Quote Link to comment
KELMO Posted February 20, 2017 Report Share Posted February 20, 2017 Part # should be 08110-62010 (right next to the timing inspection cover) M6x20, thread pitch 1.0 I looked this up for a 510 with L16........don't have a 521 catalog. Quote Link to comment
datzenmike Posted February 20, 2017 Report Share Posted February 20, 2017 I can look it up but just a timing cover bolt. 10mm head, common to all L4 and L6 engines. If it was loose then likely the aluminum threads are already stripped. If broken you would have to take the head off to really get at it. Possibly with the head off there is enough of a nub sticking up you could turn it out with vice grips. These bolts only tighten a few foot pounds, like wrist tight with a spanner. 1 Quote Link to comment
d.p Posted February 20, 2017 Author Report Share Posted February 20, 2017 Thanks Kelmo, but I don't think that is right. That bolt goes on the front and the one I broke is on the top. It was loose and it just spinning before it broke. It must have been stipped/broken already and I was the hair. There is a nub sticking out right now but doesn't look like enough to grab hold of. Is this what I am looking for? #18.. Which I think is part 08360-61212 http://www.carpartsmanual.com/datsun/pickup-1965-1972/engine-1600-(l16)/cylinder-head Quote Link to comment
datzenmike Posted February 20, 2017 Report Share Posted February 20, 2017 Yes, it bolts into the timing chain cover. Quote Link to comment
DanielC Posted February 20, 2017 Report Share Posted February 20, 2017 M6-1.0, 20 MM long is a very common bolt size. Most hardware stores will have that bolt, look for one with a 10.9 marking on the head. Unmarked metric bolts will have no head marking, 8.8 is a weaker grade, 10.9 is a stronger grade than 8.8. If it is not leaking oil, do not worry about the missing bolt. You might be able to get the remaining part of the bolt to come out with a left hand drill, 1/8. Commonly, when bolts break the head off, the tension holding the bolt tight is gone, and the remaining part screws out easily. The bolt screws into the aluminium timing chain cover. If you do not get the drill exactly centered on the broken bolt, and the drill wanders off to the aluminium, the drill will go into the soft aluminium, and make removing the remaining bolt way more difficult to remove. But again, if it is not leaking oil, do not create more work for yourself. Quote Link to comment
Stoffregen Motorsports Posted February 20, 2017 Report Share Posted February 20, 2017 Now you've got another reason to pull the head. One, to fix the possibly leaky rear freeze plug and then this broken bolt. If the freeze plug turns out not to be leaking, I wouldn't pull the head just to fix theis bolt. Leave it alone. Quote Link to comment
d.p Posted February 20, 2017 Author Report Share Posted February 20, 2017 Would you pull it to replace the rear freeze plug? 1 Quote Link to comment
wayno Posted February 20, 2017 Report Share Posted February 20, 2017 Get one of those small mirrors on a telescoping wand and check the freeze plug on the back of the head after warmed up while running, use a real bright flashlight so you can see the freeze plug real good. I would have thought heater core hoses also. Quote Link to comment
KELMO Posted February 20, 2017 Report Share Posted February 20, 2017 The 08360-61212 shows to be one of those bolts that has a regular bolt head with a phillips screw head indentation. M6x12x1.0 FWIW, I have an L16 and an L18 block in the shop, pulled this bolt on both, it is 20mm. Also found the same bolt in the bottom of the timing cover on the drivers side of the block. Quote Link to comment
banzai510(hainz) Posted February 20, 2017 Report Share Posted February 20, 2017 When ripping a old L motor apart scam the oil pan bolts. That will work also. But I think they a little longer. Quote Link to comment
Doctor510 Posted February 20, 2017 Report Share Posted February 20, 2017 Would you pull it to replace the rear freeze plug? Unless your hands are size of a guppy fin, you will have to either remove the head or pull the engine. 1 Quote Link to comment
d.p Posted February 20, 2017 Author Report Share Posted February 20, 2017 Lol no guppy hands here. I was asking if one would pull the engine just to replace that freeze plug? Drove the truck around all day today and ran like a top, love driving it when its warm and sunny out. 1 Quote Link to comment
DanielC Posted February 20, 2017 Report Share Posted February 20, 2017 The four oil pan bolts that go up into the cam chain cover are longer than the 18 other L-16 oil pan bolts. 1 Quote Link to comment
d.p Posted February 20, 2017 Author Report Share Posted February 20, 2017 The 08360-61212 shows to be one of those bolts that has a regular bolt head with a phillips screw head indentation. M6x12x1.0 FWIW, I have an L16 and an L18 block in the shop, pulled this bolt on both, it is 20mm. Also found the same bolt in the bottom of the timing cover on the drivers side of the block. 20MM by what? Quote Link to comment
Doctor510 Posted February 21, 2017 Report Share Posted February 21, 2017 20MM by what? You need an m6x1.0 bolt that is 20mm long! You have to learn how to speak metric if you own a Datsun. Quote Link to comment
Doctor510 Posted February 21, 2017 Report Share Posted February 21, 2017 Lol no guppy hands here. I was asking if one would pull the engine just to replace that freeze plug? Drove the truck around all day today and ran like a top, love driving it when its warm and sunny out. if you are a smart ONE, yes you would! 1 Quote Link to comment
DanielC Posted February 21, 2017 Report Share Posted February 21, 2017 If you own a 521. you have to be bilingual, and know a little bit of British pipe. Engine, transmission and differential carrier (pumpkin) are Metric. The body is Imperial, body bolts are SAE. The engine threaded fluid holes are British pipe Quote Link to comment
KELMO Posted February 21, 2017 Report Share Posted February 21, 2017 20MM by what? Part # should be 08110-62010 (right next to the timing inspection cover) M6x20, thread pitch 1.0 1 Quote Link to comment
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.