stuart Posted September 10, 2019 Report Share Posted September 10, 2019 (edited) 1 hour ago, Andy303 said: You need negative pressure, either from manifold vacuum or the under chassis venturi effect, to provide proper crankcase ventilation. The catch can captures the "gunk" before it enters the intake (hence the name) though on a high mileage car some fine oily mist might still be draw into the engine. Stuart: On your TR4A is the draft tube installed in the "old" location in the engine block, or did you blank off the fuel pump and tap into the blanking plate? I have the lower pipe for the catch tank into the block where the original draft tube would have been, though being a 4a it was blanked off originally. Stuart. Edited September 10, 2019 by stuart Quote Link to post Share on other sites
rogerowen Posted September 10, 2019 Report Share Posted September 10, 2019 Pretty sure my old TR2's just had a pipe coming straight down out from the block with the angled cut as mentioned. Always got blocked! Quote Link to post Share on other sites
Brian Eldred Posted September 10, 2019 Author Report Share Posted September 10, 2019 So my friendly garage has had it up on a lift and checked the gearbox oil level, which is fine. The oil on the underside of the gearbox is engine oil, so it looks indeed as if its coming out of the crankshaft rear seal. Can I replace that without the engine coming out? 3 hours ago, Andy303 said: You need negative pressure, either from manifold vacuum or the under chassis venturi effect, to provide proper crankcase ventilation. The catch can captures the "gunk" before it enters the intake (hence the name) though on a high mileage car some fine oily mist might still be draw into the engine. Stuart: On your TR4A is the draft tube installed in the "old" location in the engine block, or did you blank off the fuel pump and tap into the blanking plate? Andy I was indeed thinking of dumping the catch tank filters and running a pipe from the tank under the chassis to get that venturi effect. Not sure if 3/4'' will be big enough though? I could move the rocker cover pipe to one of the top inlets and use a side connection for the exit pipe maybe. My crankcase vent pipe is connected to the fuel pump blanking plate. One last question, any preferred supplier of timing case oil seal? The other thread I was reading was about a 6 cyl engine so I guess different. I see a biggish winter job looming.... Quote Link to post Share on other sites
RogerH Posted September 10, 2019 Report Share Posted September 10, 2019 Hi Brian, most oil seals on the crank need a great amount of strip down. However the Australians have a different view on it http://www.tr-register.com.au/Files/technical/scrollseal.htm Roger Quote Link to post Share on other sites
Brian Eldred Posted September 10, 2019 Author Report Share Posted September 10, 2019 Hi Roger, Looks rather daunting. However I like the idea of the small drip tray bolted under the bell housing. At least I'd know how much was leaking! Brian Quote Link to post Share on other sites
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